Malicious PDF — malware analysis report

Static analysis result for SHA-256 9832670e603a7c1e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 10:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87b00198a52e4b66a405e26eb5e0fc88 SHA-1: e7e72efa3be6d33129e1ba62c1157d5601fd037f SHA-256: 9832670e603a7c1e494df4e5abe3ff5cb8955d9a4b99e75cf2aa0173c447d6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to various external websites, many of which are hosted on compromised WordPress installations or other potentially disposable domains. This structure strongly suggests a link farm designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=4th+in+goal+2020
    • http://pcserviszlin.cz/ckfinder/userfiles/files/32557898255.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/kinexo.pdf
    • http://mevlanaasm.com/resimler/files/8419603059.pdf
    • http://bulk-supplies.com/userfiles/files/98942859575.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb2e1820c3c3aa7379a254e06d685331/85575338735.pdf
    • http://cyc.cz/pictures/clanky/files/kufomejijekajejo.pdf
    • http://sanzmendia.com/userfiles/files/64909955602.pdf
    • http://glavis.biz/userfiles/file/64250607443.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614414b8216b3---gisesajurujinodu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3aadc8dee---42983764672.pdf
    • http://humansharehouse.com/userData/board/file/94571483077.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a985c34dd---63778114031.pdf
    • https://lorus.rs/files/14859494424.pdf
    • http://tucholainfo.pl/userfiles/file/nakutelegakurasoguzelipob.pdf
    • http://kiapelhrimov.cz/UserFiles/File/57017477316.pdf
    • http://balie.overeembv-profielen.nl/upload/files/vugasanelasasakuwutuxerip.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/16354361246.pdf
    • http://sl-light.ru/design/img/upload/file/85337027581.pdf
    • https://agrilaui.com/userfiles/file/laxovokefe.pdf
    • http://chronocertif.com/userfiles/file/feriwakepobokegijos.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/69840082875.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE1 16792 bytes
font_01_sfnt_off0000c6f3.bin
954988cc9cf6c456dd8451d9bc4a3f7b88189cf25d264cd7dc4decda3fe2bae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 15408 bytes
font_02_sfnt_off0000edee.bin
6841caaf7423b18ffca47b52259ba8d163b6feab32683e8e94d70b8a329d0952		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10208 bytes

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