Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ea44c96f31369d…

MALICIOUS

PDF

105.9 KB Created: 2021-07-05 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 210c94cbf939119f8c3bdc2c70b82e44 SHA-1: 5fcc27ae7b447b9493bf01f3c1ec60b077777532 SHA-256: d4ea44c96f31369d3c809800e9f4f1a9c1c1720dd068c39d382677585361c72f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://tutek.eu/userfiles/file/96818404804.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sfgj34pjpvkdeq2p8ueifr329m/49464181540.pdf
    • https://thietbiytedaibao.com/media/files/xelevawisagijo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa43299e1---82175708562.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b6db125b075ca3d292833a9fe1894e16/gajijekeduwotiti.pdf
    • http://willbramephotography.com/23182017193.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/71878438104.pdf
    • http://ankamet.com/userfiles/file/71003146921.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca714c74d---4676449113.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/40bg2lhkcg3p7k5ljn0r2sl5vm/17660200299.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babf325492e---nirakemilanimotiwefefa.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f152b452---88056924905.pdf
    • https://wagaskar.com/media/77346205731.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/763d51da1792f07aba8d7dcb7bc9e567/forobi.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mq5jiffeetsd22hqj578epltd0/vezikojomatip.pdf
    • https://alternativecarrepair.com/userfiles/file/lebubikuxixejebojij.pdf
    • https://repare-ton-smartphone.com/userfiles/file/vedipo.pdf
    • https://atlastoursntravels.com/userfiles/file/wusutumeje.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f288e29a61---75112368617.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/92d1e105076ee1c3e58fa2f9dfa7479e/debututujawezuve.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a51386aa---91217239118.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/busmit0rirqt1nq7a234kc6kg6/4502725900.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/b31e1kudhhno8njme0nkg63uor/68899336410.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e8633c13f6abcff8d1847e2ca0d40857/pewozibaluposarovuxesebe.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/kupexajibevawuke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=defiant+timer+troubleshooting
    • 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_off00013769.bin
79d884a2837b8fea2126f23eb4d8d7582860133f76d5980dde0a98734e54dd12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 10904 bytes
font_01_sfnt_off0001506f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1506F 16792 bytes
font_02_sfnt_off00016881.bin
4b05cef52c43b054317d3cec0bca541e35ad2b1991d944b89aad47953f18b7d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16881 18980 bytes