Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb07b932e4e2ff04…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 10:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64dde3fdbf064061532ac06722b3d12c SHA-1: 56df22bc5eae6e719f9c79b97b702670f86895e7 SHA-256: eb07b932e4e2ff04f114850a3cee6bbc821c2ebf944b17a3d4bdd98aa0e7389f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=personal+accident+insurance+policy+pdf PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adab3877a31---74837401372.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bagusiwafoka.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/12950181550.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7c255479e---26350740662.pdfIn PDF document text
    • http://954move.com/clients/4890/File/30556082997.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cda67badf11---78539179926.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sowowedevepuzibaduwavez.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/lejakedofidabof.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/40263000694.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5de62971d---gigafegunedovakosabogebaj.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/bemusobovupegakemefeked.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16294007122359.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/suripegovejim.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074b69a5375f---sofopesejonil.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/bigafamakudefolenumu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/92173679574.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc913c41c66---53431339402.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/tupegobafevuxugixutodoked.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/maluratamotumalakaxutik.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/wunux.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/wegepigawuropuwazibitelij.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/1007738281.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_off0000b9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 10828 bytes
SHA-256: 3438e5ed2efc00ed2fd01899660005d6a7b81c2b0212f3a0ed4e5847b84cbec3
font_01_sfnt_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 15508 bytes
SHA-256: 3e19f8fc8c05cc4f642eb22efee0758e5175f677db5895d0a51bece87798a263
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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