Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df9f1a411819516…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 05:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8adc614a8f8c7e8c4e7bf855a5747a9b SHA-1: 573c47b3649410874343b95a6337e48aab6a318a SHA-256: 7df9f1a411819516fb7f3bf2a30ba42415c90ae41df2fc5a6c58bb9362c4edb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9624

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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/46d7d08d52def0e403cda6d36e0a5d23/digewik.pdf In PDF document text
    • http://teormech.ru/teormech/usrimg/file/nizulo.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/14726707406.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/44850231632.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/gakusifobu.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/47900728388.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ab5d5lngdajlhklrlefmsnndq2/dupawemos.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/worubipifubotemu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/da70eb7f7b8901da3b52dd0e5ab830a4/kudusitepilif.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/moxepalajusajanikoj.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3908841f8---meviwemavu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fa90a154---59286925969.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/dumanu.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/wumot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+a+rattlesnake+cold+bloodedPDF link annotation

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