Malicious PDF — malware analysis report

Static analysis result for SHA-256 113ad01d3f9eff01…

MALICIOUS

PDF

73.4 KB Created: 2021-07-30 20:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4617e78677e7710db31d3e43f6595a15 SHA-1: 72c8c6045a59634da909398509b085de5eff9198 SHA-256: 113ad01d3f9eff0179507d9c75b020e04fbcb5e59275cde69f8f1d3d0f389045
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9720

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=juice+onn+wireless+charging+pad+instructions
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/874d68ea6cekncu1nasn5g6sh4/67474115582.pdf
    • http://terralis.eu/catalogue_dynamique/file/32948074434.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b1fffccda814105802b6c19e3ad3da72/1098153489.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3acc52ac---vimuxomisibumawetonodojuk.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c45244637---ruxil.pdf
    • https://cristalensi.com/public/File/nukalome.pdf
    • http://forter.vn/hinhanh/file/76319734899.pdf
    • http://chiengthai.com/file_media/file_image/file/lexuluropuketirijojawawe.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25ea9d16f---wibojojabogukobi.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/88965602698.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1988268---vijuduxilupiwabo.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ek8u8tlsasdufqko18dd6i3u6i/zibijulozoladuranumopetu.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/7rhf6ps1hgqklocugfe39oo9kv/49332324669.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/48271202696.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a378e6e0814---nipagosuda.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e0f68468---ziwunaros.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/5ddgs86gf193et50c0rvcbnn4d/56782296090.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b068eb13938---getewizerotogetis.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73621cbd5e---temugakoriwuwerazofeteben.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/57151685880.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f539f12f---defosunejibavuwagup.pdf
    • https://baxsporthorses.com/userfiles/file/33906507492.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4973869f2318eaae8cd9ef3f0eeaba18/matopivokivu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin
b76b3f4d1792c3cfec338e20e9c36bcb5c50c8e528db3bd2cdc4c8a40589e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 18208 bytes

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