Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c311b5e334960b4…

MALICIOUS

PDF

177.8 KB Created: 2021-08-02 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 249710b309b74c169344b690903db139 SHA-1: 64ddacb51e0627b07febf22ea0782175113c47d1 SHA-256: 6c311b5e334960b475dd4a6d2187ad096e6388f6c25bd78d8cd71919ed9d1ff3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

Heuristics 5

  • 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.
  • 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://uleiuri.ro/userfiles/file/jiwewufezilufaxiwed.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb70fb89c8---46673507872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cbde8c68c---11280663901.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa064cb55---60961427576.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74008073b---xonevefuwiwexezoxefetuj.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nunudatidepakoguparip.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jovepabadivusoridagunexo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a7a6cc9b599665a57c3af84553d3973/35775933327.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fuxerejigav.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/iva5s69033toak63a3e9m0hqgr/mulixenidoliwoxuk.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/rezaseguditetudiwamiga.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/moreremotod.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kuporufaxafujodawunal.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/8653421841.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/63223675919.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/41486121684.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1bfddb5b4---93941853370.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/nisajikom.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da09adbaa---32274314248.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8de7250b0---tiliwa.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40906943069.pdfIn PDF document text
    • http://grabnerestriche.at/tareboluvavaweru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sda+zulu+hymn+book+downloadPDF link annotation

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