Wilderman's touchdowns came with 3:50 remaining in the third quarter and 3:58 in the fourth.
After Wilderman's second score, Rylan Cole came through on the ensuing Illinois State possession by forcing a fumble that Jalen Moss came up with to set off a celebration on the Indiana State sideline.
Peterson Kerlegrand carried it 19 times for 61 yards for Indiana State (5-6, 3-5 Missouri Valley Conference Football). Dante Hendrix had five catches for 55 yards.
The win marked Indiana State's first in Normal, Ill. since the 1997 season.