hello friend, I think I can answer your question.
I think the theme was purchased in vBulletin, the footer says
"Powered by vBulletin ® Version 4.2.0
Copyright © 2013 vBulletin Solutions, Inc. All rights reserved. "
regards.
Is this a custom-made theme? It's looks pretty straightforward to me. Maybe that's the way it's supposed to be. Still it serves the purpose. The focus of this forum should be the content not the looks.