Malicious PDF — malware analysis report

Static analysis result for SHA-256 3769e71db00bda50…

MALICIOUS

PDF

72.3 KB Created: 2021-10-15 21:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e8ba54e4eaac48a312cf2774d05ee47 SHA-1: 86ba18e987b1183fb2bfcbf19de39c5d1eaedfb8 SHA-256: 3769e71db00bda5070d34f1eb69d0b26dfc15e27bdd6ed35166560d3f8e2941b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file containing JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7166

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ujcnpo36l2vplj1dlu98n3e4ng/11241754049.pdf In PDF document text
    • http://timnhanhonline.vn/upload/files/sumuresodej.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/36947413224.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/94255790449.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1968d1ee8---fibozarawewoluxixijum.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3bd0691eb245b7850ab3d5baeadcce53/natowubave.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/14505170570.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/vufavulexofalawariga.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/10/12/molifijofevidekowa.pdfIn PDF document text
    • https://phukienbep.net/media/files/66920189892.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/wupirakikopeleraz.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/pebexiligazos.pdfIn PDF document text
    • http://ciskmv.com/css/file/93060868126.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/93312436365.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/50124015214.pdfIn PDF document text
    • http://vaynhe.com/upload/files/59718137748.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643fda1793---57745875852.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nabidaruvepakedineg.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/mokogaloniposofowisigepef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616592c41ba2c---bulebuse.pdfIn PDF document text
    • https://superchills.com/userfiles/file/muwol.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=most+realistic+rally+gamePDF link annotation

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