Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e6438ba7c8e72…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 07:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f9c896876fc74ff636258ed93c2bf9c1 SHA-1: 12ada811bcdf9634ac19ca681d467923e960178a SHA-256: 771e6438ba7c8e721cc51832d627b9f76e9919d124f470dab575d7050c51f4c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

Heuristics 5

  • 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
  • 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 https://catamma.ru/uplcv?utm_term=gradual+responsibility+release+model PDF link annotation
    • https://812423.qqtogeljackpot2.com/contents/files/bogusekaw.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/32879482738.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/pqsh97hbvboq3l6mm0i6jupaf2/72757347182.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/41048849471.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/91450812767.pdfIn PDF document text
    • http://japhina.com/upload/file/94003191306.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150fa422f265---7399831356.pdfIn PDF document text
    • https://ahha.az/userfiles/file/ruwilizonegojevogarux.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/toxuzefusit.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/40352135403.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34396285887.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xipod.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/bimesagidoji.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109051709119062.pdfIn PDF document text
    • http://cpils.com/userfiles/file/kixamenawagasitabolama.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/vudukuxenesatopurifapuw.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/zazapapogasifinaxixosifo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/ralezowona.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gokimuwuxedilema.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qhn5mgb15faf56vud253fg6ip4/rinofatades.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gamakoxejavaxusixexepasam.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 10948 bytes
SHA-256: f5f53de584145f192d1a25ac185581ed110ed9f4bfba3461ee8e55fbc8ae184e
font_01_sfnt_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 16384 bytes
SHA-256: e9eee396269f63fc464ff8cf8afb256281fe646d5561affd80314f85cd5405e5

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