Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52468a4ec399c31…

MALICIOUS

PDF

68.4 KB Created: 2021-05-02 22:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aef916c11412ba87fe8f02179ef5c44 SHA-1: 5189f3d226fdf9fa19c6b57e7923fdc5f57df91c SHA-256: a52468a4ec399c3110a673a682bbfa8ecd251f79798dbd33b0ec043d1ad0eb1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d663467e---bulag.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6630483dd2663095674fb0d8d49dc3a8/76854966459.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb19b1cea---80740302908.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/056b24a6c9e3d5a682f18836058d0539/15986252188.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee15ebf3f---zorugetoxitaz.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f038a21133---84650127072.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac8f8c8f6---galon.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865e751137e---17274859092.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607459f55908c---40482055958.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083281ef1b86---wovunukewivaluribalepi.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6077c17618b12be77d73cfb93aaa9f19/wojas.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d4e4063e8d8edf13c3f9b9f0dda74c/wetotuzep.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1305852f---regeneminojumeluvu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e91d6ebb---gebimo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080683bc9a84---10269128514.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/015d68ab81da92686a30aeb44e6471ea/3737736993.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/03232f08e83022a1f6222e35a4fd1358/84008953909.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9644862e---rofemesusizunawavabij.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd85baf1f---jawebojovabitoxitas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=subtraction+coloring+worksheets+1st+grade
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc9.bin
8422111a0c0752561f900668149b085b696e0099fb8d6d94d8146e8416ef34b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 5652 bytes
font_01_sfnt_off0000e30f.bin
1b6f05658df64551eca025760ab341332f1e9fe547102c2069ee482b746333b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 9628 bytes