Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66ad119cb74be64…

MALICIOUS

PDF

56.5 KB Created: 2021-09-04 17:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8066d613b4916c127c7a8c73927687a SHA-1: c9fa3545bf549ff5a636b4c767761d0f615fb5b9 SHA-256: f66ad119cb74be649f897f1eacf9c9dfca6f45b25e3806c7d1428608fdcaaae0
94 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier also flagged this PDF as malicious. The primary function appears to be distributing links to potentially malicious content rather than containing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7727

Heuristics 4

  • 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://jooli.ru/ckfinder/userfiles/files/67702187404.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f6618e04---63925739781.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/sudaboxobebivineliseluku.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/51bd43847d59c6c0efdc3e47b9933856/23735836683.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/vevukufajoxurised.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/waladof.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2eaee6043d36a842b83dd9190a45316e/gidobokog.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/nafojegumegupaviporak.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8579tjclm7sn9tqrch86ls58td/viviletubinibugov.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4757039a---jodetebag.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/balokenepokidage.pdfIn PDF document text
    • https://airbays.com/userfiles/file/64912615310.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6u3cb7827s00tqrtjbhnag6m7j/rukexikekumuluwaka.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/31394548023.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021082516334878.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098af750a9df---mojidudebebipasime.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71ec36a12---zetitanofugidutut.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d6130dfa---66670073685.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d655bb62bdb---96498182037.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/waranesi.pdfIn PDF document text
    • https://retta-bg.com/userfiles/47834871884.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/55487959384.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/47305969387.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/60528189711.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2ltmquhjmrc9s7p7i5m7m0ajl7/2967923018.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zesazaniboseraveg.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd99d275c95---32956022847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pmp+6th+edition+exam+questions+pdfPDF link annotation

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