Malicious PDF — malware analysis report

Static analysis result for SHA-256 2126e8164e7d10b8…

MALICIOUS

PDF

74.4 KB Created: 2021-06-28 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23a7f7a789849f350e9df38fd5d05c3f SHA-1: 53a1de3504669fb740716531f042fb2ee6892e8d SHA-256: 2126e8164e7d10b8b79a57b8df5727a2232367b9b8ea7b1d15f02c70e8f0e8b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ahkjt.com/upfile/file/65601286771.pdf In PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/9332958885.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/ruveranazomirizoj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8af70b208---42101081684.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/75740388538.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a099163a134---filazimijuxatiberazub.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d235c4b4e2e---ruragadagidem.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/m665llmgr7kgibnumiu7qia0kd/83012380191.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zegefi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mefipex.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/697401349.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/latuladineraruva.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/70702430750.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/gavufawedonavomefosan.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/966100837ac1c38b83fd3018bbaac443/vunabuwib.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/62198111385.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/eb8vba3i733gse66d2l224b1h2/nivubojabewarifuwivi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77572877873.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2887411fa6c488ad6d4378fdf686c022/xunaxedetur.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab891d96a---62925049582.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/zigapas.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/96793100273.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabe1e6627---wogag.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/14433704250.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kewumipilasibigodazupexet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=star+trek+the+cage+streamingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC074 10676 bytes
SHA-256: 51bddfadc5f1a5a8c7ad79720a40144df3f7408fe7673294325002848fbc84ed
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16700 bytes
SHA-256: 402772bfa88ee2fdf7b45aed3023247e6786afba28bef72819ae67a9d0310e3c
font_02_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1