From the logs, a hacking attempt:
[Mon Feb 17 20:27:36.945552 2020] [core:error] [pid 19422] [client 51.89.203.215:55852] AH00126: Invalid URI in request GET /302499392-post1.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 20:27:37.652369 2020] [core:error] [pid 20644] [client 51.89.203.215:56085] AH00126: Invalid URI in request GET /302499392-post1.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 20:53:55.257596 2020] [core:error] [pid 28364] [client 51.89.203.215:62154] AH00126: Invalid URI in request GET /101988-post5.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 20:53:55.919858 2020] [core:error] [pid 27399] [client 51.89.203.215:62476] AH00126: Invalid URI in request GET /101988-post5.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:09:29.664377 2020] [core:error] [pid 30516] [client 51.89.203.215:57590] AH00126: Invalid URI in request GET /302472840-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:09:30.171944 2020] [core:error] [pid 32135] [client 51.89.203.215:57646] AH00126: Invalid URI in request GET /302472840-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:09:31.743377 2020] [core:error] [pid 32174] [client 51.89.203.215:58029] AH00126: Invalid URI in request GET /302472846-post3.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:09:32.229631 2020] [core:error] [pid 31083] [client 51.89.203.215:58063] AH00126: Invalid URI in request GET /302472846-post3.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:36:26.231797 2020] [core:error] [pid 8097] [client 51.89.203.215:64850] AH00126: Invalid URI in request GET /shell-programming-and-scripting/172494-help-php-code.html,,.%27%22%29%28%28%28
,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 21:36:28.762564 2020] [core:error] [pid 8086] [client 51.89.203.215:52928] AH00126: Invalid URI in request GET /shell-programming-and-scripting/172494-help-php-code.html,,.%27%22%29%28%28%28
,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:09:41.629862 2020] [core:error] [pid 16788] [client 51.89.203.215:56519] AH00126: Invalid URI in request GET /303025580-post6.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:09:42.198972 2020] [core:error] [pid 15734] [client 51.89.203.215:57356] AH00126: Invalid URI in request GET /303025580-post6.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:08.019840 2020] [core:error] [pid 23510] [client 51.89.203.215:55171] AH00126: Invalid URI in request GET /302799439-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:08.424898 2020] [core:error] [pid 23516] [client 51.89.203.215:55199] AH00126: Invalid URI in request GET /302799439-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:10.639223 2020] [core:error] [pid 22472] [client 51.89.203.215:55563] AH00126: Invalid URI in request GET /302616739-post3.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:11.046557 2020] [core:error] [pid 19847] [client 51.89.203.215:55666] AH00126: Invalid URI in request GET /302616739-post3.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:16.084988 2020] [core:error] [pid 23489] [client 51.89.203.215:56519] AH00126: Invalid URI in request GET /302217201-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
[Mon Feb 17 22:27:16.498612 2020] [core:error] [pid 22129] [client 51.89.203.215:56604] AH00126: Invalid URI in request GET /302217201-post2.html,,.%27%22%29%28%28%28,%20../../../../etc/passwd HTTP/1.1
server# whois 51.89.203.215
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See http://www.ripe.net/db/support/db-terms-conditions.pdf
% Note: this output has been filtered.
% To receive output for a database update, use the "-B" flag.
% Information related to '51.89.203.192 - 51.89.203.223'
% Abuse contact for '51.89.203.192 - 51.89.203.223' is 'olivia.messla@outlook.de'
inetnum: 51.89.203.192 - 51.89.203.223
netname: OVH_247786588
country: GB
descr: Failover Ips
org: ORG-MF142-RIPE
admin-c: OTC14-RIPE
tech-c: OTC14-RIPE
status: LEGACY
mnt-by: OVH-MNT
created: 2019-11-27T18:51:24Z
last-modified: 2019-11-27T18:51:24Z
source: RIPE
organisation: ORG-MF142-RIPE
org-name: Florain Florian
org-type: OTHER
address: Hamburger Strasse 520
address: 22850 Hamburg
address: DE
phone: +49.15233512915
abuse-c: ACRO24657-RIPE
mnt-ref: OVH-MNT
mnt-by: OVH-MNT
created: 2019-05-14T14:09:14Z
last-modified: 2019-05-20T15:07:16Z
source: RIPE # Filtered
role: OVH UK Technical Contact
address: OVH Ltd
address: New London House, 6 London Street
address: EC3R 7LP, LONDON
address: UK
admin-c: OK217-RIPE
tech-c: GM84-RIPE
nic-hdl: OTC14-RIPE
abuse-mailbox: abuse@ovh.net
mnt-by: OVH-MNT
created: 2009-09-16T16:09:57Z
last-modified: 2017-01-17T09:52:03Z
source: RIPE # Filtered
% Information related to '51.89.0.0/16AS16276'
route: 51.89.0.0/16
origin: AS16276
mnt-by: OVH-MNT
created: 2019-02-13T09:06:24Z
last-modified: 2019-02-13T09:06:24Z
source: RIPE
% This query was served by the RIPE Database Query Service version 1.96 (HEREFORD)