CleanTalk: Malware issues

Hi there,

I have installed a Security-Plugin from Cleantalk installed.
It has reportet:

Malware issues

Time Jun 04 2021 00:12:01
Hostname http://www.xyz.de
Plugin wordpress-security-2.67.2
Scanned files 7430
Result WARNING

These files may not contain malicious code but they use very dangerous PHP functions and constructions! PHP developers don't recommend to use such code besides it looks very suspicious.

Failed files: 1

Path Modify time MD5 Hash Plugin
/wp-content/plugins/gp-premium/elements/class-hooks.php Apr 27 2021 19:24:48 8f940160c12bfeaf0513d7087d862759 -

Please, check scan results in your WP Dashboard:
http://www.xyz.de/wp-admin/options-general.php?page=spbc

What should I do?
Upon finishing the scan you will see the results in 6 different categories:

Unknown: Unknown executable files spotted in the system. These files don't come with WordPress by default. It could be anything.
Modified: Modified executable files of the system.
Suspicious: Modified executable files of the system with suspicious function names. WordPress does NOT use such functions.
Dangerous: Modified executable files of the system with dangerous functions that could harm your website.
Critical: Modified executable files of the system with very dangerous functions — 99,5%% that this is malware!
Outbound links: Shows you the list of outgoing links from your website and websites on which they are linking to.

How can I assess that?

Thank you!
Wolfgang