Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb312c5ace508e91…

MALICIOUS

PDF

95.6 KB Created: 2021-07-07 18:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58036fdb8f5b1793827da768eba984ca SHA-1: f7391cd3df835335974b1dd2822557a2f853470f SHA-256: cb312c5ace508e91ceee01190ae98447825841d44974a39f57f530064a574fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=sailing+across+the+pacific
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4607d24d167bf3e115f76a5b914b807d/1917327477.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5kfiiadf5ng5cgafpjqmi21t2e/tolukomawegiduniwuwetab.pdf
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/bakisavumugukojevezupi.pdf
    • https://burlingame.com/wysiwygfiles/file/76575567144.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/perepetumatitumijoras.pdf
    • http://akcjonariusz.com/UserFiles/file/42858956702.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160796f05541d9---85269375569.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/23705c2168fb7debf8a94aa9b3c0151a/6213545658.pdf
    • http://teakdeck.pl/files/file/69474894334.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6f059fh23rkhj38v1mgn7ajqr7/wogatozetoxapexipisaxus.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/31254337587.pdf
    • http://gleneaglehoa.org/images/file/69155204507.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/foraboluxunasedagetakubaw.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/705072f6f1be60946d10a8984ac33e41/9000773063.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cee40de8ff4---6239857139.pdf
    • http://www.mostex.sk/files/articles/file/37649790244.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eld7or3epgio4qh4n5id61qs7s/wizezelapagapefezeji.pdf
    • http://sam-global.info/files/file/lavuroroj.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f3e32d2b---bozenuroxugujuramobovewez.pdf
    • http://abogarestudio.com/userfiles/file/weduxotixolidupawezibepud.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/681f16f813258dea1edfeadf9135aae2/ketusefokif.pdf
    • http://ural-resyrs.ru/data/file/19259938554.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a6.bin
e9ab259a4df225af0858a7f699d35156ebbe6a553cae46fc1b73a09816cd24c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 17012 bytes
font_01_sfnt_off00013edc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 16792 bytes
font_02_sfnt_off000156f3.bin
1bc91ca37b5b2459614a9bf16c1cf3913bc77db565ceeb2154f4b9d75bc1d6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x156F3 10832 bytes