Hidden pixels on a WordPress site, how to remove?

Question

Malware

The situation is this. I began to notice that my site was getting a lot of redirects to various spam. Viewing the code did not give anything. But in the chrome developer tools I found a 1-pixel nasty thing that is executed by a script. I can't figure out where and how to find, track and kill this script. Advise what to do. Thank you.
Here is an example of what inserts pixels on a site:
< iframe src=" bcp. crwd cntrl.net/5/c=508/ran d=1490 695807539/pv=y/rt=ifr" style="position: absolute; overflow: hidden; visibility: hidden den; height: 1px; width: 1px; bottom: 1px; left: 1p x;">frame>

Answer 1

That's what I'm talking about. I checked from different computers in different browsers, the effect is the same. That bastard sits there

Answer 2

According to www.sitealyzer.net/en/p/sb/remove-bcp.crwdcntrl.net, this is a local infection on a specific computer