Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe7debb343ce511…

MALICIOUS

PDF

84.0 KB Created: 2021-06-17 06:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 71a5f3dc4674408283cc066ce08d483f SHA-1: 9eb14f6205b39ec67bde1af8bfa2b3614cca5deb SHA-256: dfe7debb343ce5110301b1f3107a9ad7f3b9d6cf3249173bbd894d8b2c856dd5
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8798

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://synerhu.ru/uplcv?utm_term=valorant+sens+convertor PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dadh04bdc07d13ad5m9us6o0lc/digidanarobeburugabefu.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/zenupivu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/95b3b4fea42958688fd8c1b87c6723dd/zaguxixesenafa.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/37562954174.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/loe5bnqlrthnfgsi0ud0m8rjvk/12506784267.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b26fc205b72---fidelawenesijilofox.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nudqku2qmh0i4kdoi9k8lfbcqg/23670052738.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j3seql63mp165q4okp79oi65ok/fukufulitoris.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad52c12e91---80022031218.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xevuwegilunijim.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/25771937247.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/27094568627.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/23312363597.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pifezeriwetegoxutobib.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084cacd3f317---84764173370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 4820 bytes
SHA-256: ba0c96375ca5d7881d90290a6dc8cd7c6ed186fd24728def197b8081ba0899f2
font_01_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 12288 bytes
SHA-256: 47142fc7d74d745aa03936d7d8b53ce16ca01a7b080dd187f6ac29d0629b648e

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