Malicious PDF — malware analysis report

Static analysis result for SHA-256 922c04cd70caeb6f…

MALICIOUS

PDF

56.6 KB Created: 2021-06-27 17:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 532c086ca2f1e4342fb0e63c4d7eca64 SHA-1: d1ac13bf60f97cdc2d7e042136b9394dcae0e8a6 SHA-256: 922c04cd70caeb6ff975860a4244828817212c836c84aaded20970a1ee258627
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document's primary function appears to be redirecting users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6836

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/986naum1vsi8tlbmm3pm271fvi/wadoboxabijimibiwi.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nfe5cr8m52bb1vv59opehqqgf8/79794719666.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b489d88573---39157834298.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fb29215186ae2a938b322a50f2602d00/65381681430.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61313de403---66800710107.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0d858io0t36glnlem4t1d7tf51/15038631248.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltr7om4uu5itudjlhcmlqc8k05/welabir.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f1bd55e2---10452242938.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/13367035139.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/lawolufoleregave.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf2bda9b1---vilakivejuda.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614103236850975.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///742276312.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/29604557485.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sndao42ko6lg5jp2ggdpq3bu55/35190803425.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b3jb13gvl825npa0alcoug0f45/sufanizusexi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/32602274944.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/268dqpv5utncdh3t6bclhuppi0/48228448739.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/wovezad.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ad29008b---gedutuximuf.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/vuzep.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/605f563d112284515ec570d133939fdf/zoxadoxobikozedew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fundamentals+of+industrial+catalytic+processes+pdfPDF link annotation

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