Malicious PDF — malware analysis report

Static analysis result for SHA-256 4844a4cd0ad31a89…

MALICIOUS

PDF

64.0 KB Created: 2021-06-07 01:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e57c1b00572cad89e1f1c4df670d5e1 SHA-1: de873cfc3da33c8b2ef3033453b16d549bcac3a9 SHA-256: 4844a4cd0ad31a898218a3fa9dad13e081c742749c905279ebf8469757cf0525
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for popular search terms, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=zubeen+garg+assamese+song+mp3+download+pagalworld
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846048bc2f---13449615157.pdf
    • http://tafgambiatours.com/userfiles/file/45681361454.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13b0dd153---padenuwinelakawebotuto.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/clucq56gcegq9429bkjestqns0/99423731402.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0cfb894695d569c6b343987ff63163a0/wiwikorurinigodapinatiz.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16094063b72d14---72679338879.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7b9cbf5b---semotimiwelazez.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160846f27bdf3a---juxivavagetepuv.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a20ce4fe74dc3c679840e68c74537091/tedomixasud.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6816343eec19fde94e5433a0fe483e6b/47469831260.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac32582c3a---48387315694.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b87f4bfed---jisalolazewazinurabuvenen.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/lipukizoneregegukego.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c7d20022---11864332707.pdf
    • https://alutat.com/data/file/dogesesirozepekezut.pdf
    • https://alshaabcoop.com/userfiles/file/retatazuvu.pdf
    • http://atdawnwelift.com/userfiles/file/lerefok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin
ff6122e1cab1ba645a4391f1868669059010fff1d99a40ad2dda79c8ffcd9562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5388 bytes

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