Security problem. What happened and why only Chrome is ok?

Hi there.

After the update I’ve found in the login page in the top corner left 3 textual links that are showing the “lost password” text as for the normal login screen but they are leading to some gambling sites. Same in the dashboard using other worpdress standard links, and always in the left top corner of the screen. On the website also some links are replaced by this damned stuff. And the most strange it is happening only on Firefox, Explorer and Safari. Chrome is not affected at all. See screenshot here:

https://www.fileswap.com/dl/78cSSClq/

I replaced all core files without success. Any help from your side? Thanks