Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4f9264773bc6a2…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 19:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c4083a21caa70f4f7030688190d486f SHA-1: 173a100c66ee94b048adb1bd3dbe37f945a3fbbc SHA-256: 6f4f9264773bc6a2620ea717a49f4f354e2bf5005bf41bbcdfc7ca5e9ada73ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to obscure malicious intent. The presence of 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly suggests malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=how+to+mobdro+on+firestick PDF link annotation
    • http://gospelpour100voix.com/fichiers/newsletter/file/zizoxevobawefezibipuzem.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gozetejez.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/janadud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13cc55aa5---30884554822.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/64044249990.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f452134c6e21aba7a6534295e63da36c/70215075913.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/tapegavulenazopifenekug.pdfIn PDF document text
    • http://maulich.vn/attachment/files/nojosud.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/kitisirazofibe.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xaniluvebifepul.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pekidakiwifusipuxo.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/ruzivedarijodelikod.pdfIn PDF document text
    • https://pixel.bg/img/file/fubizafumedamuroguka.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wuvijaz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/60185a0703283a1a90853c4ea38541c0/72372308539.pdfIn PDF document text
    • http://matras-devison.com/upload/file/81930048041.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421db4c4aa7---15358032081.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/12791490560.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/netudepafut.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/77553182294.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fesenozuwozowemiduxodabe.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/bilixebob.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/2964985338.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/96890487926.pdfIn PDF document text
    • 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_off0000c39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 10736 bytes
SHA-256: 441d60d25437f029523c33878e2d0d3e1dfc1f37bbb7dc7947a1302d79538dca
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16768 bytes
SHA-256: 5dde326a5899fcef6fa324cb595f303c1654066aee5fda4c43dab117b064a213
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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