Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8096370209908f7…

MALICIOUS

PDF

91.3 KB Created: 2021-06-14 21:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e0dd1fd3518e3e90ab2dbc68723843 SHA-1: f46f28f3522b1589ea5a181f91d20c7152190667 SHA-256: c8096370209908f76ea64774076155aa22405cea1e708c9e4157871e0ed01a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=spell+slots+arcane+trickster
    • https://badoza.net/userfiles/file/87872264030.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/lerujidedubadijazevoj.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/453d606c095e6b24a8d4e6aab200bc0e/favuleguveninonanipida.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160742b645cf59---833557309.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1200c9b8b3---5791770413.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4021603fd---gululem.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e011fbfd6e---vubizabu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01a804827---61498740705.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6b91e3cc---52469476690.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e4303aba---lejomibovemimap.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0385c530---vasiwipiduvekonupazogolo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9461980ccec93308c8593cd30c0b6886/tumegewogejasowazobed.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d21e010a1e760ed317af5cec74974c69/nopabogikusipege.pdf
    • http://opusincertum.it/userfiles/files/bozivemeranenem.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c429cc4d---8927572135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a29.bin
4ddd6e8cbd4a9e13f82a5976d55b25ed0fb0fed0ab43e479c5da5b41216e211d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 5092 bytes
font_01_sfnt_off00013b8b.bin
554214be2161e171b5e4a1d7bfdd753f7baf7bb63042429f3f26692d7917be6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 10912 bytes

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