Malicious PDF — malware analysis report

Static analysis result for SHA-256 0741eae7bcdb73ef…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 10:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58080f4131c132504ded360fc57916a8 SHA-1: 9f9f4b63df49c739d4ac398e2ef4bda0669485c4 SHA-256: 0741eae7bcdb73ef90384c4af379a8bffaa167464a67238030a8576b186b728a
196 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised CMS uploads. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the nature of the URLs and the lure suggest the PDF is designed to lead the user to a malicious site that may host further exploits or malware, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://oniceh.ru/uplcv?utm_term=change+dns+android PDF link annotation
    • http://gdgom.com/upload/file/210908200639994225orx1dg3h0th8.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/94732916872.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/dirozorutumukital.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/42348614841.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xuzisas.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kugidawefigogede.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/77015150788.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/dakudekojejoluwe.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/25349491774.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45992259115.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374450babed---tidevozolevurisara.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/50191161796.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/12199580002.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136324ca828e---fipagulumike.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/92882543655.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dijuwalixadewasekelonitu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2b05418a15b756491ddc73640ffe715a/tiwiluniwesepotilovakem.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kamexurowe.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/83191558357.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2nbj41n4erdbh7ntkubih21oh6/43531838732.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koraf.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900567831b---22943827757.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/86629225261.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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10412 bytes
SHA-256: 18890194d5e67d852a8a5793c33fd812bcaf08bf8fac9b88f35bb5acd9d8be38
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 17620 bytes
SHA-256: 578e8e5f031fe0513df3a93253c2d3943344ded9736be4620e8470022ad49a36

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