Malicious PDF — malware analysis report

Static analysis result for SHA-256 8796f74752ffc95e…

MALICIOUS

PDF

72.0 KB Created: 2021-06-21 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 23d84cea9f12705da21665dc5fba6b47 SHA-1: d3c49480cd20edfe97e3e893b180b08ee20985c8 SHA-256: 8796f74752ffc95ea3d99760057d769e6c4c0d5c8037fc910c60279c16c9f598
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The document body contains a lure text 'Activate uan number online', indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://anhuizhkj.com/upload_fck/file/2021-6-16/20210616155629925086.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/kesaviburazo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba97f622f5---bikidatoreletel.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/53915862976.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867092e3940---81897717336.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/53704744665.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ecda62cf507573793125e0cadda58106/27649183456.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/sunon.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fe8ea5f6---vozedabivitede.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/b6u31l9ut9qp73as31len878ji/tefavar.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuvefuzanuva.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7263f6ad6f741a29ba54b70a6204e28a/26091213124.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/wafite.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/9130530505.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/21090543690.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/leriv.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/34139848305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=activate+uan+number+onlinePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 4956 bytes
SHA-256: badf2a5041d5bd174f51d65407f5e4161aaa411552266ed9313f4959f5d47630
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 11060 bytes
SHA-256: c83789ab46a7484db02aeda6a36a47fdd05f3b1abd9a4969769600be39f27b7a

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