Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81de3bc8621c080…

MALICIOUS

PDF

150.9 KB Created: 2021-09-06 18:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c6f4cd4b2a8ef8885da228f3061b392 SHA-1: d17b41533ea40c028d1e8c4f8c1ff3534fbc5ae7 SHA-256: c81de3bc8621c080025ffbdd0869df17686241ca44628962c5a2c113d2ec0b96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to act as a lure for potentially malicious downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=zero+waste+management+case+study+pdf PDF link annotation
    • https://voyageaventurenepal.com/upload/files/betoxugaretipamefejo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/41508797263.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/95181540911.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81892401e6---jimuzo.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxidanowowijezevu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/wudokadesemirigopug.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nuzewabadiradimevawovukit.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204184d0d1b---74654076039.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae7508ce5---32314876670.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/8251385699.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gblrctgaol3ua39ih74fdokg90/93388303711.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec84ed5787---kiluwi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/23769854ba3138955e320db555b0c681/xozoxopabimureta.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/650258aa8cc766e95d0127f6dca5533b/jixovonuvofozobeji.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/81971215963.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/melemonenuzaj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e2ca30e9a9a2fbef67934104f2c62b1c/mufafevoza.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12268791896.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/mepiluwegasusotazasatirus.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babeaf8c8a0---24642294358.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/lukitifos.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/fedoperevi.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/35693691165.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/t13ip9sos2o648cks2r3b50f91/xitemosevet.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_off0001e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFFF 11088 bytes
SHA-256: 403edb6cd73541e8dfa7ed2b438a9c3e9e84cae6e05a2d583925e5f855a50786
font_02_sfnt_off000219c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219C3 19868 bytes
SHA-256: 401c1661ca84137a8ea4d120816ee0885d6de2d2b6b789c3c379967c846f4cd1

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