Yes, you have been hacked. I just fixed a site like this not long ago. Too much to go into here.
For starters search your plug ins and delete the ones that do not belong! You will see debase 64 code and they will be running upon start up usually... and the your files..over write them with fresh vbulletin files! Upgrade your Vbulletin now to the latest 4! I am willing to bet you are using an older version.
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