Unless you have some specific reason for wanting to do a marathon right now, with that type of base you are likely better off doing a good half. There will be lots of years in which you could run a marathon, and it doesn't need to be a "beat yourself up" exercise.
The one thing which particularly argues for being moderate is that you were recently hurting. Accelerating to get up to marathon training distance is more likely to renew the injury. Since the objective should be to enjoy long distance running and to make it a regular part of your life, why risk things when the only effect would be to allow you to do the marathon six or seven months earlier?
If you really want to be sensible, run a half this fall and then look to do something in the range of 25 to 30 kilometres next spring. (These aren't common distances but they are fun. Mamilton, Ontario, has a 30 km "Around the Bay" run which claims to be the oldest annual road race in North America. It predates the Boston marathon by a couple of years.) If you respond well to the longer distance, then train for an autumn marathon.
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