Malicious PDF — malware analysis report

Static analysis result for SHA-256 a661885ccf71d64f…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 23:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8f05b73ef42a35dd3d88d186cb693db SHA-1: 0900cbcfdfe5b23acf31e57f5db7c48619ce85a1 SHA-256: a661885ccf71d64fd17b3c9fbe35f02c08e1145a470c40eebe6d025a9b7aa530
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript, though not fully analyzed, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/lonanazisokox.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0d28e4dc12d62ff629443d33fe6bb366/pukewasokaga.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/zetabotezubalopuvelig.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/m6t917vemc5ntef5h2fisr98g2/18056472374.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/65971184804.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/rejobinedisoz.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/wiwuvuxemojugu.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/77459341441.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulujukugaxilarujelamo.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/pabadul.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/270ed502da89e0fd130e2e4584a212d1/69968240114.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/80338a68102f12c497ddef4f915e0b56/90160699269.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/75628037370.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/2676426745.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/panufumofinoluja.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/76840893194.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/linupakov.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/movawotagitifariduxe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fad3c254---tesakudogi.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/56385344175.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zujovaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+thickest+layer+of+the+earth+calledPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 10668 bytes
SHA-256: afc4ab6fd95b2d5d1441ad8c811a1d3a8260a3b48da776b36ccfd3fd8945ebe3
font_02_sfnt_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 19176 bytes
SHA-256: ec1676cc8403aa372e1147c0d13d30dc792e071ed346b411f915a43378509bb2

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