Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eb569cb945dd6e…

MALICIOUS

PDF

80.9 KB Created: 2021-08-28 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfcfc3d9eeeaf469a019c1997866c685 SHA-1: e65d17279dc956db5f55010616fc92a31c34ab15 SHA-256: 25eb569cb945dd6eaea59437f4bea042466608e4be882d0bfb02fb4157706b43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click on these links, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cructi.ru/uplcv?utm_term=linear+and+nonlinear+data+structure+pdf PDF link annotation
    • https://lacgl.org/upload/editor/file/84361107288.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jozerevozu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pobajadowokituburuvifakip.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/pibozozokimotinizu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/kufimamopunaralamuzot.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c72112bb07db87771bc8ec8069446443/lilivikukifogizadanadido.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dfac4c5b0705a98ecf1a69a988f23824/20261634002.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2527f3cd---fuginuvasu.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/67922338130.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/lujigenomuzoritudiwenavel.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbcab9550---matage.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/13666705999.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/83491072309.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f681dd26ba2---11554896044.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b49eb96b786---wuvapisokusiza.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/libuku.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/fowatilugoxet.pdfIn PDF document text
    • http://normel.org/files/upload/file/2275248713.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88efb92099---57689264417.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/13386099773.pdfIn PDF document text
    • https://udruga-invalida.hr/files/59364566681.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24523098828.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23d498984---jefudikazewabo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a9355555---13286511594.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 16964 bytes
SHA-256: 119a12930250f20dbbcad3495e2a7c998a543c9b29568da6d03b2f92b626f1d0
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 15896 bytes
SHA-256: b496ebd94fe9a2fa895eaefcb833f9a514f25925ab7849f79f980d43c61028c6
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 10668 bytes
SHA-256: e7e3b04d0fff039d4a9d60cc750c8339056ffce5cb20d524d51fb711333854e0

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