Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3505662c95d5d5…

MALICIOUS

PDF

101.0 KB Created: 2021-09-13 11:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db100631a4691fd33d270abbc66f17ab SHA-1: ca7d6301141b51542485d08cc4636b8825518e60 SHA-256: 4e3505662c95d5d5a6292baed5ad301744a9612f22060e358b7c20b524620018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://newfrio.com/userfiles/files/gavesagobe.pdf In PDF document text
    • http://train-in-japan.com/images/blog/file/5048669597.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/revixebobifajenejureduza.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25191774090.pdfIn PDF document text
    • http://weingut-suppan.at/files/8384553999.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139368755271---46977906697.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/87b89ba9d1bead41aa66bf58888411fa/dotun.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161305b7eabfd8---43769624128.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/tunoluwowaxel.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/27378407147.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g3tvovci22lknrq8lnj5tmgpag/78677286313.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/15461808248.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d1dbd7b---gejiwejipupige.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/fufameduwimebalu.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/pukinuvebuvev.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a236ae803a67141409c9c2aa68ce9bf/lelejigesidaripabipur.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/22405508269.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tasitarojuwuvejunikuloli.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/15410128853.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/13801949736.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/42820851267.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161392b46b5ddb---vemonuwomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378947dd8c7---vilamunujagi.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/83254101423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+x+and+y+mobile+game+downloadPDF 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_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 22676 bytes
SHA-256: 13ed70e601f1ea21e303b95cbe3e21ff76e452bb8b1c621e8f0d54a19bd3d4b9
font_01_sfnt_off000153fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FC 10760 bytes
SHA-256: 217b3fd3a4229ecbbe8bf285fe84c7c7320710d7a91ed504ff1d6b09762fcd55
font_02_sfnt_off00016c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1