I also looked for this fact a long time ago.
Now that I finally found it, I share the address here:
Result by WhatTheFont :
https://image.noelshack.com/fichiers/2019/09/1/1551071582-insidious-font.png
The font has been modified for the film
Bearbeitet am 25.02.2019 um 06:13 von Axeluuna
Alle Zeitangaben sind CEST. Es ist jetzt 13:08