Yes Wakestate - there is a little bridge on Wirrabarra Rd - crosses Little Ugly Creek; dense vegetation. And, if you drive up Wirrabarra Rd - it runs along side the Creek - steep slope dropping off towards the creek, again covered in dense vegetation. It is not too far up from where Little Ugly joins Kholo Creek, so it is plausible for a body to travel down when the creek when it filled with water. You leave a body there - may never be found. Not exactly on walking tracks! I suppose I am leaning towards Wirrabarra - but it may well have been Tyamolum.
You would know better than me. I have driven down Mt Crosby Road plenty of times, and through lots of parts of Anstead (where the houses are etc), but I have never been up the roads in question.
As you said that area is spooky. I get that same feeling, but then the majority of driving I have done along that road is late at night, and with no street lights it can feel that way.