Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df8439e65f7c3fb…

MALICIOUS

PDF

79.8 KB Created: 2021-07-22 08:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c711bf6b90ba369903883c28217bc97f SHA-1: 82cc9b649bd0cb4abd305dc45d0dec96ce018304 SHA-256: 5df8439e65f7c3fb24a754d3ee981bcee588cb42f1a3bdb0097218141e92e2d3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5782

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kirakuramenandsushi.com/uploads/files/futiko.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608348853ef91---jusakel.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/45331332735.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/xonanugod.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/45528862571.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/26034398629.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gevufinug.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/1559600218.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/sezoxesukuxagokobera.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/puputuxubef.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ec58f80185e40d74100c0bf579e0a429/kabixunetumekimowora.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/25810691716.pdfIn PDF document text
    • http://aps-mes.com/files/file/fipakomasiwed.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/lojaxifufegoli.pdfIn PDF document text
    • http://st03.it/userfiles/files/94131297103.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e4bdae138---8984470146.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fc25b44250cbf2d119ffd5ee9bec3cc0/mobevakoruwovuw.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/25ff1ae749a33505cc6c02b7583686c5/18889646076.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5b4554e66d608d7bf71201c338bcc1f5/zezolitudoxadotikit.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f86b2218c---13614540616.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/43256220670.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/vunejesimobus.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/lorogagorifedewo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/26166195665.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9kpgtopmb1689ouv3terd12fh3/23929657879.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/30252342425.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a5a7b026---tesibedabaxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jesus+40+day+fast+in+the+biblePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10776 bytes
SHA-256: 2026ff303c176e74d7f1d3dd1b204a9e38ca37d649c4be11bfeb58a7ccd9fc68
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 18864 bytes
SHA-256: caa8500cc829ecce4118faf9908ecee45354f525c305874b57e55d615bdb8517