Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9398fad90f5d81…

MALICIOUS

PDF

47.7 KB Created: 2021-09-03 03:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 078395c0988de76cd8ae7bda6779dc00 SHA-1: 5960fb297fe51519483e10d777f1c8f0d42fbd9b SHA-256: 3b9398fad90f5d815125a0b7e6cb239c87c9b6f8cf4c6160e90b37905d3746d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that point to compromised CMS uploads and disposable hosting. These links are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

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://queure.ru/uplcv?utm_term=anupam+typing+master+book+pdf+free+download PDF link annotation
    • http://gwhs79.com/clients/867100/File/53862353180.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/70215565074.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2192198d9---70724607225.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kabafodurerizumuxavetijix.pdfIn PDF document text
    • http://ezibra.pl/upload//file/miraxezuzuxuzezezadefuvo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/17212306083.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/wobugab.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447a81e881---3015301164.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/71858874231.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/kidupubejufi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/detifofabuberiw.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7fba51bd6be50c7a298694bd785ace37/92055012894.pdfIn PDF document text
    • http://servmed.net/userfiles/file/61283591105.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tomefumuxupigomu.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/14107179196.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/5046338409.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/gekukewolakiwusebilut.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3733e4575581966dbd73d7c2cbead3f5/zopepoxadobowowunovej.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sl3r8goti4pceg14cnv9gjk9ah/pobivimowupalurid.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4dd9c60d7---12681097039.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/22733635415.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/ponubuxuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f416cec7f4789c7f78237bcd74ebf65d/56248240832.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7aecc1f2---bejebope.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/229d83a9af672610b8519ea390b7a623/ripowifopixo.pdfIn PDF document text

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