I've had two WordPress blogs hacked into previously. That was in a time when I was doing virtually no internet advertising, and until I found time to deal with the situation (weeks later), these sites were penalized in the major search engines. They weren't eliminated, however the evaluations were reduced.
The how to fix hacked wordpress Codex has an outline of what permissions are acceptable. File and directory permissions can be changed via an FTP client or within the administrative page from your web host.
It is not uncommon for sites to suddenly be hacked by a random person. In fact, even entire domains get hacked. If you aren't a programmer or a programmer, there's absolutely no way you will understand anything about programming languages or codes. This is the main reason why some of the people who do not know anything about codes end up if there are some methods thinking.
You first need to create a new user with administrator rights before you can delete the default admin account. To do this go to your WordPress Dashboard and click on User -> Create New User. Then enter all the information you will need to enter.
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Change your password, or your WordPress password and admin username and collect and utilize other fantastic WordPress security tips to keep hackers out!