Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a8ae9140845c6c…

MALICIOUS

PDF

79.9 KB Created: 2021-06-30 20:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3356714b261987dc394ce9724c30df SHA-1: de72e88e4870dab5ec1ea47ddc64f83624309c38 SHA-256: 57a8ae9140845c6cf2ae6656107a7d942c9ee6b7bf9f9a88e8db47f6249f9327
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised websites, likely as part of a phishing campaign. The presence of a callback lure suggests an attempt to trick the user into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://xn--o79av69abka850ab6c.com/upload/file/202106200803392957.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d1f4b556---99275120297.pdf
    • https://senhewood.com/d/files/89233890014.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ca9ea4c32becca9bd990b29e9c7178fe/wamodexeka.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a2cb1cbe---borozafe.pdf
    • http://jfhcoaching.nl/userfiles/files/mobubunifuz.pdf
    • https://retake.dk/ckfinder/userfiles/files/relisezuxixeribovot.pdf
    • http://joy05.com/_UploadFile/Images/file/27383648963.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4aa059280---gojegutit.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7cf01a5a8e02314511baf5a205674d84/13929401978.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bc062bd25---kanamugizowuwezulevajami.pdf
    • https://editionsitaliques.com/userfiles/file/51382317182.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a05e442da---xowexenisagovizelu.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gf5jbu7au866e8v8e0ud004a7/joguditebufoxi.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607306cf9043b---wedaxepax.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/pumeduzifupemipokof.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079014198143---zokekavodunitolajokoxi.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd20be9ee2c723e760ff520eab8eadab/nenadaj.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/290fea82416db1a68cd52e0bcab3b733/29360313760.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bbd571c5d75b1bb2f23a0651dc686616/24077679317.pdf
    • http://ahlhy.com/uploads/file/231912482005.pdf
    • http://arniestribu.com/campannas/file/26444932268.pdf
    • http://ahkjt.com/upfile/file/derinasejuvewivu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d14187e0---11201644897.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/46d120d4d1ea670f9baa830e6db863f7/84732650758.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=weymouth+police+station+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54c.bin
fcf90964d3284360bd058ceb056736a6609733d97e011c8c6aeba21346037c7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16780 bytes
font_01_sfnt_off000100fa.bin
b5031c17e85147d499fe6ce33276a0a0eb65ed5ee6f3de1b3a70ce0cc4f0643e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10984 bytes
font_02_sfnt_off00011a19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes