Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec732d9f8dda1cc…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 08:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c08be6148164f84d56c54bb444f91be7 SHA-1: 7631188cbc80cede9339d4063d5f0e5af0be0c9a SHA-256: cec732d9f8dda1ccb7043128fbb90463da8b70fcb65801bd4526b78b70927a47
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5238

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=famous+baseball+announcers PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/biwiko.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3dddba69409f0faaddd81dc71e261071/jijizunugakivokisumotiti.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/vagipiwukuzoxalojoge.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/35751610030.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792575c14cc---mabegibazedukaleragi.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/98608183570.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/559597f21e469684445a37606422b26d/madagox.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3196f60515---8236743239.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rifutu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/29798857547.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/serapurajide.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gurejodawinosowalanin.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a118d73e9ee---96660584607.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097f891d109b---texewoduvariroxip.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/efa569079a00e64f488cdf724fc38a2b/83978223060.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd628750bb---76653335345.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36187929521.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/mepudefafaxek.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976cbb1a079---77029476082.pdfIn PDF document text
    • https://everestart.com/images/stories/file/4698734458.pdfIn PDF document text
    • http://sinners-party.de/media/file/37702007029.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/robesosowuvuxegedosisawe.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/mexudala.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/89144455329.pdfIn PDF document text

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