Malicious PDF — malware analysis report

Static analysis result for SHA-256 277d4e9bc7ef7380…

MALICIOUS

PDF

72.0 KB Created: 2021-05-03 07:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede581bb03a687ef70bacf2024c2fe93 SHA-1: e1305552e3f01f7383bd31403172d0ae8a41a013 SHA-256: 277d4e9bc7ef7380c299bb4c92ecb11a2d756cc1ce74dc0bb49cb8cd5e307d1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f38bf802ba---12240348337.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75cbd3b11---buzobujedokuzewixosuw.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344040416d---19534048430.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47f180f75---47674957835.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082519c23211---soketerovekegimim.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076531bb6359---54908218542.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0a980d01---45627078358.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9f80b93f---tegagotevilekedof.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bd11267a---66667017586.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afea907bc2---40919599550.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc12d52071---57943297116.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/03naatau15d9eep20palkqla8f/63927541947.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5c4380de---dotegizagepewusamas.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fa91b6e22a304496411321858d0a1240/zakudidigad.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/250af41d03da9614304338b498a99950/61546501366.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47a5b43b3---miwivaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=psat+nmsqt+practice+test+2+answer+key
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2dc.bin
9eab6b75538f5ff973837a62d0efc31f95a45d96cf1aa304799782660658f266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 5564 bytes
font_01_sfnt_off0000f5d8.bin
0e9a08c286f7233f6ebc7ba04e217590c44b2193262d6bdd957fbfa4c2a780f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 11524 bytes

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