Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac91b469a3731976…

MALICIOUS

PDF

41.4 KB Created: 2021-06-24 18:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1261d60b12271f81f95e319f69b43089 SHA-1: b9a2021db82992fa66fc9c283e77e8dce6097f0d SHA-256: ac91b469a373197641bda08e420f131485773b8b2b75199f5757e13d3736a933
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content or phish for credentials. The document body is heavily obfuscated, but the presence of URLs indicates an attempt to redirect the user to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

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=glencoe+mcgraw+hill+practice+skills+answers PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9363b6e9ecee8ea4821e668f301dba19/27252816765.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070140f33ce1---96771613571.pdfIn PDF document text
    • http://limoride.net/gallery/file/49767978172.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776795bb219---65969044222.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/41700103467.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9jkjoqvrfcp86l918qdv3qmse1/tedizewosadaja.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/796f1c267fabedee53ebf02b3ec308aa/gukesosozatibawurimax.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7575e8bba84d7b0474500324e002058f/jarojabu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/215a08daec1c78e0602ee86de780454c/67589692327.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/55e2370ee601d76280869d93f1465c4f/kekulumukinovo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05dcc3b23d---vaxawefavunasunomoxodew.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/siwudolokenakoz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccdd402a2---27576476548.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/rigenisobanutuberugegi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bca76ce264a---zafavobojagafiv.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cfda15cbe9745eceb438dc0b0a9e0145/93243986347.pdfIn PDF document text

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