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Simple Sabotage Field Manual (Office of Strategic Services, 1944) is full of suggestions along these lines, which appear to still be in wide use.

I prefer the more mean spirited "aggressively stupid", but I don't want to tempt a splintering of the "Hanlon's razor" people - I'm quite happy with the mental image I have of them already.

You can always go deeper:

1. Not malice but incompetence

2. Actually malice, trying to make it look like incompetence, but being incompetent at that makes it... both?

3. Actually being competent at feigning incompetence (the ultimate malice?), perhaps we need to develop a new 'razor' for that.

This needs a wikipedia entry.

This is "Grey's law", mentioned at https://en.wikipedia.org/wiki/Clarke%27s_three_laws

It's reversed. You look like a harmless idiot while being a harmful mastermind.

Malice is itself a form of incompetence.