Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b063314f9fb1d4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 05:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb7a20511c60a3ac2f0387392e763256 SHA-1: 9dca28b6698db8df204aa3e2832f663969507122 SHA-256: c0b063314f9fb1d4987af5c4792bdff1dc110334ff942a010be3e332db177d70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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
  • 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 https://autoprofi.ua/userfiles/file/33727310000.pdf In PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/782c1d70c69c3bc7e46fe081930295c4/44214067643.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/roporovamuviturabexo.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/64207632097.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rapuvesukuxetirapojidawe.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052505265966.pdfIn PDF document text
    • https://isosklo.cz/uploads/56029266110.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b6e25cfdc---87804499335.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cdc808c2b25b50d1c9a0dcf8fb107df5/55191825228.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zezitatutikukoka.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9c7c0d43d51eb86d6d73d92ae89c4bd4/4831825885.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6dfdf7b9---46739364516.pdfIn PDF document text
    • https://tpk-m.ru/files/file/10259354014.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56b5b4687---niwonawamugasux.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210603000945.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lj3k8cndjqdq5gfpkctvleg9c4/36551774170.pdfIn PDF document text
    • http://4bx.pl/public/file/89284763890.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/suforina.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jonesomaxanasebukef.pdfIn PDF document text
    • http://farashimirooz.com/files/30084231589.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kepajojon.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/91854549217.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/rexujopafuwapugejodet.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc043924a8---81524615978.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/20285296209.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/56074377919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=appsc+govt+polytechnic+lecturers+notification+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 11160 bytes
SHA-256: 12067ef7575b2d104fa129deddc0452f39acc41dc455db844a02cdd934246568
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 17296 bytes
SHA-256: ee2987dac1db7adb7552b4c9f619fd89f450ed1d353973b4246796e2752dd704

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