Okay. I further investigated this issue on my own. I downloaded a new plugin Exploit Scanner. It found that a lot of the plugins I’m using are infected. I got rid of the plugins.
However, Exploit Scanner still shows 4 level sever matches.
The matches can be seen on the picture below:
https://gyazo.com/c8e72b113444e7ed4a288de809a4dad3
Should I delete the codes shown on the picture?