As Basil said - it is not a common idiom, but appears to be a made-up hybrid/variation of 'fallen on hard times'. Based on the idiom, I would say that it means that the house looks as if it had been used for evil purposes - something like a caricature 'Dracula's castle'.

It's from a detective novel 'The Franchise Affair'. And I think I get your point. I will put it in the context and see if it's right. Thank you so much!

There is an idiom "fall on hard times" == "to go through a difficult period of time (likely financial difficulty)". There is also a phrase from George Orwell's "Animal Farm" - "fallen on evil days" meaning the same as the previous one. I am not aware of "fallen on evil times" but I think you can guess the meaning from the context. Which book is it from?