Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ce2749d9e4f8b2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 19:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a82eb21b25ca3659dbf1b2ec66d62064 SHA-1: ec01bc00c01f60d1a253dca9d98e786efc2dacd4 SHA-256: 84ce2749d9e4f8b2d0e478aff730dd1c82f30ce1ecbb2b03e53eebfc6360e853
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the link farm serves to obscure the ultimate destination and increase the chances of a successful compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5948

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=newest+rpg+games+for+android PDF link annotation
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/62218273153.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/13016612029.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccf4d124a---94838356942.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716862d40---kulateludivifa.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rinuzagomotigaf.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/42417024734.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/2864539082.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901102508369629.pdfIn PDF document text
    • https://penal-garazh.ru/files/tosulevikojivixidoj.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/muzalebininoluve.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94244377549.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/95667223809.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8503a74ab290dc35942d60baf171239f/xenezunalexejoxep.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/38198951441.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/lajadafadufomaze.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/fesaxe.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/52857549503.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/83973191083.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/80205598346.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vivinirupimeliwafu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/44889531544.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/86617111759.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/makoselutusasisimeze.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909113729287.pdfIn PDF document text

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