Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b9aa79caf16b4a…

MALICIOUS

PDF

102.8 KB Created: 2021-09-02 14:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c322257090beb5c241c00f089f4580d4 SHA-1: ed88b287371c31f70bbe3749bbb6bd3f56aabefa SHA-256: 39b9aa79caf16b4a6adf01cd4b9b8873a0504ee67164b9f20166648f8f2977b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially disposable domains, likely intended to lure users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect users to a malicious second stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chcial.ru/uplcv?utm_term=manuales+amir+11+edicion+pdf+gratis PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/3m30m4im6p31ca5j4jm6d10tj8/jagiwinuzilonufa.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/31723603971.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/gumiwiwidilomobokosemaji.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/55706891875.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160909bf20b8c8---43343676514.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/41167718709.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m4u2jjdm45bhesci4flmpe4tb0/93151767876.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/80a153d4f741f815ed3de9646b0ffe8d/puwipera.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/12830786733.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b0df052d7af6f02acc28328cda6af7a9/wutoxafegilidun.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/29192102723.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/42569698378.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06964a6a04---lolabubewadibef.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/41d6c1d9763c38486da50d360b0afde7/sibogaluzadum.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/banukuli.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/47336941072.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gatinofenafagu.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/74432678558.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e22cb8d4521a8957858686dee5641032/24151827691.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/85412199078.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fopomijukowikaginovosiwol.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ff4669ea4---8396871040.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/23820487120.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 20920 bytes
SHA-256: a9b5ec36c063eb8e4427564c7458d181abc3222bc44cf3b2312ea3592cf3fc0b
font_01_sfnt_off00015b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B94 11108 bytes
SHA-256: aef3579825b7bb9b17ffd6c3bef3220334830426e9729cf42d5a33e5069bef59
font_02_sfnt_off0001754b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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