Is there any chance of attracting parasites on summoning low-level entities like bhootas and pretas

[Mulberry]

Sigils come from the Western medieval grimoiric tradition so it’s normal that you wouldn’t have a sigil for a ghost. You can expect imposter and parasites with any kind of summoning imo. There’s a tutorial here for detecting them you could look at:

Forum Tutorials: Parasite Collection

How to detect imposter spirits and other time wasting things