Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf35cabb437d3fa…

MALICIOUS

PDF

44.3 KB Created: 2021-09-21 12:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6227fea8c13461ddf8ee98dcc3c07bdc SHA-1: c833793173bd04e88b1bfd472404bce6bf78bf91 SHA-256: 4bf35cabb437d3fab1d997f1365bfbd511eb031db50d5706c8230ea300b01d25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7749

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://huntic.ru/uplcv?utm_term=airplay+alternative+android PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614401c0be4e6---faminapolubikazaxatelu.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/57438984000.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zawevibexetoredarokol.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/vonaneveruruwolazuberosek.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lidurukovulugelabefapesex.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wufavanetap.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7a47743e98362fb16c529d56c46fed52/9860144656.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wofazig.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bipojuta.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/92732646276.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3bgu2fdqfth9813nes10f2pgn/lolavedafenawaxidi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zemagu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/pidowugulub.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2073194779613cc93c41fa0.pdfIn PDF document text
    • http://talleresjpg.es/img/file/99777001548.pdfIn PDF document text
    • http://innersolutions-uk.com/file/46878602930.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/vowiginagiwebepoxipif.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f9634de9---26678688945.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/tibusotisuvofumanowawodar.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/mifurijinapomulunixoturo.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/51072771099.pdfIn PDF document text

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