Is possible to add attributes to the armor or the sword?
example:dev.bukkit.org/server-mods/lore-attributes/

Weapons can have effects & add extra damage, but not attributes not in the same manner as lore attributes. There's also no support yet for armor conditions.

I think the attributes stuff is already well covered by lore-attributes - OtherDrops can assist in giving you ways drop these items with custom attributes :)

OtherDrops can assist in giving you ways drop these items with custom attributes :)
How i do this?

LoreAttributes (http://dev.bukkit.org/bukkit-mods/lore-attributes/) will read custom lore and affect the player depending on that lore.

With OtherDrops you can give items custom lore, eg.

  SPIDER:
  - drop: DIAMONDSWORD~Diamond Sword;+5 Damage

Read through LoreAttributes as there are a lot of options you can add for both weapons and armour.