Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a7436c79306772…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 13:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07dc87acea65c2de6cc0fcaf7b49c95e SHA-1: ee3989ab063b209221c8e7cffffa0c85cdbbe098 SHA-256: f6a7436c7930677234ca9d2cf0bc4acf6bf90d0745dee7b940e041a6f61b735c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 http://dinhvi5s.com/images/newtech/files/vefazi.pdf In PDF document text
    • https://eminentland.com/admin/userfiles/files/kiduwu.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/jofivujutoworesoderu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180b94afae---23259599073.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/65307689831.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tubalogozivixenarow.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lixod.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/99370129412.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/30109718929.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/44116658638.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nexeja.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8212270d02fa0b49de9c880712788bd0/48946616450.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vuxukorivineg.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/kovuseduraxarajejix.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141184a7ad0e---nakewif.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vimarirupa.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/65317294499.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/judiwavofipi.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dizevodunelepi.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobujenedogu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29003576539.pdfIn PDF document text
    • https://cooperspick.com/files/lizujelamuli.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/72476491637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=redecor+game+apkPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 10484 bytes
SHA-256: 0afc39824cc2d2ec6492b3ea010eeb13f03664b038b9be437bb5ae27e7805fc3
font_01_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 15364 bytes
SHA-256: 0d4adfc5b42a5d8dc30e81905b0f4c18c1c280c63e03d9c9486e5f1ed4bb663e
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1