I have seen this image in a couple of places around the web, but never a name for it. However, this is my guess. It looks a LOT like a scaled down A7V... the first German tank ever produced. Here is a 3D rendering of one:

And a real life photo:

Now here is the "Mystery Machine":

I think that someone did a DARN GOOD JOB of faking a picture of an A7V to make it look like a one man mini tank. It looks like it has been cut in half, changed the tracks to off road tires, and resized so that it looks like its for one person. Even the side machine guns are still on the mini tank image. I have no idea how they would even fire... much less, how would you aim the main gun and reload it? And I dont think tires like that even existed in WW1. Almost every rivet, panel, and line matches up to the real thing.
Anyway... that is my take on it. Its a very well done, faked photo. Right down to the wrinkles on the paper. If I am wrong, (and I kinda hope I am)... I would LOVE to know what it is. But I have never found anything that names it. Its just TOO close to the design of an A7V for me.