Let's break down the word:
* Pull: This is the base form of the verb, a single syllable with one consonant.
* Pulled: This is the past tense form, still a single syllable. The "l" is doubled because the base form ends in a single vowel and a single consonant.
Therefore, "pulled" doesn't have double consonants in the sense of two consecutive consonants. The doubling of the "l" is a grammatical rule, not a defining characteristic of the word itself.