Ter Horst, 21, joined the Tigers in the summer of 2014 after scoring 26 goals for Folkestone Invicta to help them reach the Ryman League play-offs.
He has been part of Hull's under-23 side, scoring in his last two outings.
Bencherif has played 28 games for Wrexham this term and both could be in the side to face Barrow on Saturday.
Find all the latest football transfers on our dedicated page or visit our Premier League tracker here.
York City have signed striker Johan ter Horst from Hull City and Wrexham defender Hamza Bencherif on loan for the rest of the season.