You can use the ab-initio mode in the HADDOCK2.4 webserver.
PS: the forum is searchable, you can find a lot of information about protein-DNA docking and ab-initio (blind) docking, as for example this thread Metrics for the Evaluation of Docking Model Quality - #5 by pei
PS2: You can find an additional tutorial for protein-DNA docking using HADDOCK 2.4 here Protein-DNA docking Using HADDOCK High-Ambiguity Driven DOCKing – Bonvin Lab