Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d15d981a104305…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 23:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7778b04c3c48c773ff89a995ac8946cd SHA-1: 7703e3ade728356f5cf0b1a8ecc1f20e7adddf65 SHA-256: 05d15d981a1043059cbb758a6b8587e862e13fe03717c97d0c0d30977d7a9058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://phuvuongcorp.com/luutru/files/pupokure.pdf
    • https://indiantalentjunction.com/milan/media/pasokerok.pdf
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdf
    • http://mwbright.com/upload_fck/file/2021-9-13/20210913011047203508.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/lizef.pdf
    • http://antonioruizabogados.es/userfiles/file/2425903396.pdf
    • https://kaptenhoki.com/contents/files/63493991488.pdf
    • http://phukhoabacninh.com/images/files/77371406627.pdf
    • https://jatransfer.com/userfiles/file/puvuzojofuledevulumej.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0d039019---gejunolefi.pdf
    • http://woodbridgeabw.com/uploads/files/dibamodurofufuxenadi.pdf
    • http://sk4education.com/ckfinder/userfiles/files/manokojomotepe.pdf
    • http://sportingclubalbinia.eu/userfiles/files/siworirejomejo.pdf
    • http://geologicatoscana.eu/userfiles/files/fotizebawurazibu.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/94866786642.pdf
    • https://zivotzaokny.eu/res/file/83199062231.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/dejixod.pdf
    • http://kasintorn.com/images/upload/files/tudekegep.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac5e73e0b---pexik.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/65147612656.pdf
    • http://lso-msm.com/userfiles/file/86791456822.pdf
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kupijolenologerebo.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3de687ddf0f4b16ef86b0966ecadc39d/jugigexalonotinowiwapa.pdf
    • http://spreewaldatelier.de/img/editor/file/garab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+bus+game+for+android
    • 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_off0000ead3.bin
79cf5598bd54ef8aa57f31eb89f7c39b2404d5824b633c32391a58aa43664a97
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10884 bytes
font_01_sfnt_off000103b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
font_02_sfnt_off00011bcb.bin
7f74868cccb72f6cdf77c308262c15d362527a4f12a98fa2f9520306685f7a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 17516 bytes