Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8e114179a89af5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 04:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91fc00ea61cbc12a68e25f932e7a9463 SHA-1: e2882cf2ee0ad96c5202455bdb0c2d31cc07e8a3 SHA-256: cb8e114179a89af500498acbe9bc2ce1ab7b543c5063c2bbe0e25a8862b51055
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristics indicate the presence of a link farm on compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8799

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://allytemp.ru/uplcv?utm_term=indian+geography+notes+in+english PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d8461bc8---34236971344.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/24122963385.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/47986908252.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/28763967039.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/34427598159.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af01e3e80---8574301625.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8ad870bc4fb5ab0e7cb681e9b7e047b4/linifukamogoxezumek.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0686e072---49496002660.pdfIn PDF document text
    • http://unseretochter.com/images/file/78726450570.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c45a4ae23091d6f2aff4c9b1652d06bf/bixitemawa.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/fivuvamugi.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zulinovu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160764c8eca943---30056449361.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082246e6b276---mewixu.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/ruwajupufufogupomopetijok.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/2291841283.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/aiho5qqq7vos832sbrtqo7kilt/jujemametikiwuxo.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/kewazesamalazaf.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6204917718.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/nimunurofefug.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/kibomix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a168b2c66---nuputodejese.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/35871103230.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e4611b627---mavufekab.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5346befd---88884500393.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e97f0fc78149486e916cdf998d600816/juwexixexakurotetod.pdfIn PDF document text
    • 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10736 bytes
SHA-256: c6b4bc4b9717c78875187480d7202ab4913cced2eeffa101e502a80925fbc960
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 17972 bytes
SHA-256: d0a85a9fbb144499e1522c0978b1ab56eef0a70b635223e32659a749ba3b85fc