8. Is there a ban on anonymous donations to candidates?

http://www.iec.org.af/2012-06-22-04-25-18/campaign-finances

Yes, but record need to be presented to the Independent Electoral Commission (IEC). "During candidate nomination, each candidate provides the IEC with information about all assets worth above a designated amount. Contributions to candidates’ campaigns may be received during the campaign period, however only Afghan citizens, political parties and other domestic legal and non-governmental entities may contribute.
Contributions may include money, loans, movable and immovable properties, services and facilities. The amount of financial contributions is limited for citizens and legal entities".
Source: the IEC website, Campaign Finances, http://www.iec.org.af/2012-06-22-04-25-18/campaign-finances