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It's something in the Oncidium Alliance. Possibly a Colmanara or a Miltonidium genus.
It's likely impossible to tell exactly, or to be able to tell the hybrid, because there are so many intergenerics (crosses between different genuses) in this alliance. It does remind me of both my Colmanara and my Miltonidium in flower shape though... but there could be other things in the 'mix'.
There is a care sheet for Oncidium Alliance plants here.
AOS | Oncidium
I'm afraid I'm not good on pests so I can't really help with that.