Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d99d1b9a50c503…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 16:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 276400e54155873f43c5e952e95e1c1b SHA-1: c9a1d948f918c2675cf62fa6fee46caadbbaca1c SHA-256: 28d99d1b9a50c503bc534e339661fa8526b6d0a4785e81ac859daae45972715c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7706

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://huntic.ru/uplcv?utm_term=blaupunkt+bluetooth+speaker+user+manual PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbbaa47f4---siditajejibunowegowozo.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/e99ec29a15967be840ac0e3758613b42/dogena.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbda23c9aa7---68480883500.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/17292324994.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/65877063581.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wuvusowovatowasev.pdfIn PDF document text
    • http://geose.ru/userfiles/file/16723680330.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sapegupakojemoxiv.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb4563ec6---topijeliduloxasaluz.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/soropudufakolepetafejizi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b0ed58070---53158083335.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e273f77df721ca9a6d06bc8a09e8924/80739014021.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1bf22c55---bugavo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vja1od8fhq9l13qs44hmhc7o11/pewok.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c437c584---boloxobamuxatapajop.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607022edbba30---92783535490.pdfIn PDF document text
    • https://aashianarealty.com/file/44535222673.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10808 bytes
SHA-256: 0fced1c396788dd78ff2090fe0021278d757e2e0de170b450097cbb0114baa8e

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