Want to buy a home, but hampered by bad credit, an empty bank account or no job? No problem!

That may sound like an exaggeration of a late-night infomercial. But it is, in effect, the pitch that a number of Web sites are making to consumers, saying insolvent home shoppers can be made to look more attractive to lenders.

The sites, for example, offer better credit scores by hitching customers to a stranger’s credit card, or providing them pay stubs from a bogus company. One has even offered a well-stocked bank account to rent for a month or two.

Industry experts say these sites, which are relatively new, played a role in fueling the rampant mortgage fraud that has caused a huge spike in loan defaults in recent months because people bought homes they could not afford.

“There is a whole underground world — an online cottage industry — that has grown up that allows anyone to commit mortgage fraud,” said Constance Wilson, executive vice president at the financial fraud detection firm Interthinx.