I have had two WordPress blogs. That was at a time when I was doing virtually no internet marketing, and until I found time to handle the situation (weeks later), these sites were penalized at the main search engines. They were not eliminated, however the ratings were reduced.
Install the repair hacked wordpress site Firewall Plugin. This plugin investigates net requests with heuristics that are simple to identify and quit most obvious attacks.
Use strong passwords - Do your best to use a strong password, alpha-numeric. Easy to remember passwords are also easy to guess!
You also need to set the"Anyone Can Register" in Settings/General to off, and you ought to have some type of spam plugin. Akismet is the one I use, the old standby, but there are many of them these days.
Make a note of your password for the next time you sign in! I recommend the free or paid version of the software *Roboform* to remember your passwords.
Change your password, or admin username and your WordPress password and collect and i loved this use fantastic WordPress security tips to keep hackers out!