A site protected by Wordfence. I checked again. It could not detect any problems.
But when I check the database over Cpanel, there are malicious encodings in the "wp_options" table as written here. I managed to delete these codes from the table as in the
article.
The words I searched in the database:
default_mont_options
ad_code
hide_admin
hide_logged_in
display_ad
search_engines
auto_update
ip_admin
cookies_admin
logged_admin
log_install
Plugins I have installed recently:
Betterdocs pro:
Elementor Pro (Last version):
Formidable pro:
Liker:
Monsterinsights pro:
Loco Translate Pro:
Yoast seo premium:
I had to remove them all.
I think I will have to implement a new wordpress installation. It will cost me 200 hours. Because I did not find the current situation very safe. I cleaned it up a bit, but I'm not comfortable yet.