Malicious PDF — malware analysis report

Static analysis result for SHA-256 85732c5c4313ec10…

MALICIOUS

PDF

80.0 KB Created: 2021-08-29 21:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b79af4e42c994852c365bd4d2e043790 SHA-1: 7a146774aacb4cccfd5fe5c83a1a7bcb6bb6d7e0 SHA-256: 85732c5c4313ec1003d9ee70af704f0d7cc6cacc08f57ba8f192586e8adcab05
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple websites, several of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The embedded links, such as 'https://infrive.ru/uplcv?utm_term=american+pageant+chapter+24', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9296

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://infrive.ru/uplcv?utm_term=american+pageant+chapter+24 PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac61de3f4eeb5faf5d419baa5b93d661/xaxuvowifexirijisoduwos.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fvmf0miqqtamsnv5s7eq2vim62/kofuseditapixejunob.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jofifitenedolulamob.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/58870593648.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/mekiruvufawenovozuvu.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/33069847143.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/97341927303.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/moginujixorufaredagile.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/nixojifokigulunuxuguz.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083569d7cd35---10546464310.pdfIn PDF document text
    • http://yuha.be/_files/file/67784554110.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcf9ab60f---sumalenal.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a7e72cf968ee151c6b874e27e0a4a808/luvuvevezimufofofom.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/dazolijagefulu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66772818064.pdfIn PDF document text
    • http://pneusmarene.it/images/file/dowerinabasigidunofutipe.pdfIn PDF document text
    • http://novafish.it/userfiles/files/nalisunimoxefur.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3608fcf89948a2f2ceaf3e414e0b2d52/72303920247.pdfIn PDF document text
    • http://ruresept.ru/files/file/kaxizeb.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qt50q5tcdrttof66do7q0ju50h/61850770464.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/72297667167.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/pimedijametiriwadut.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 17956 bytes
SHA-256: 465b59eacad0eeabddaf7f7e50b4627468cdcd12f7a78558b7e5e85e89ef4588

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