Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dc6874230f754e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 20:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 956b69791fc9447b203d6b5b46ec638e SHA-1: ebbb88d37fdbd9d720ac9d5d65bc909a98b3d9ce SHA-256: b7dc6874230f754e5961bf96439a65d4015293887215db59f0b63ff698cf6c76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=the+vampire+diaries+the+hunters+phantom+pdf
    • http://stark-tools.ru/images/uploaded/xirevoto.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130b434574e4---68614603887.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613159a9ab693---74153729866.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/26276754035.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/26264036567.pdf
    • http://xaydungphongphu.com/uploads/files/degosuzewen.pdf
    • http://cheers-gifts.com/userfiles/zelowekiwuwes.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/barebopifaraxizazaxawiwo.pdf
    • http://z-i-f.ru/userfiles/file/fazuguxuzokuzatanabeb.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1099a0fd---24225167797.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/fopedudi.pdf
    • http://carszana.com/image/upload/File/xawageluzutenufat.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565735c1f1---77832192775.pdf
    • http://huyndaicaudien.com/upload/files/wewozukukolibelonupiwuva.pdf
    • https://dailyhondaotomientay.com/upload/files/23711993897.pdf
    • http://arohitourandtravels.com/userfiles/file/77604507531.pdf
    • http://gmtshipping.com/attachment/file/vepotoxowivebavujom.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d16986f02---74413329129.pdf
    • http://kadh.kr/bobod/upload/file/sazazasotoj.pdf
    • http://ebrinteractive.com/userfiles/file/10286917727.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/zarejufufojoleb.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376d47a4bea---kegurozodetofabamaxalip.pdf
    • http://ildongwire.com/userfiles/file/xejodaxujep.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/44712629679.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_off0000f0b8.bin
e4ba25a6902cb4516f145a5c7363df7305f93478d1000a4488469050a9cd9415
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 18148 bytes
font_01_sfnt_off00012009.bin
9ebbdd7e804e250c0c050eaa362cbb7b98847514d2e89157e581ca4ac81bae96
pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 10848 bytes
font_02_sfnt_off000138f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16792 bytes