Kindly reference the following links:
If Urine splashes back on you | Sheikh Assim Al Hakeem
How to deal with splashes after urinating and flushing
Splashes after using toilet & cleaning private parts (wipe with wet hands)
Does the water we wash an impurity with, become impure itself?
When washing after urinating, I dropped water on floor, some urine splashed on me, what to do?