Malicious PDF — malware analysis report

Static analysis result for SHA-256 61715367b97ae1f3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6935d08b550da3fc4b0955f0efce5b56 SHA-1: 7c82965f2691517faa8b40332695c6bce8ee432c SHA-256: 61715367b97ae1f330fe727035a691cabb7f68f89c0e66816fcdcd73d2b62a11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=watch+online+free+crazy+rich+asians
    • https://dailyhondaotomientay.com/upload/files/zekumifipamiweweke.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/812bd0062069bd9bd66b4c191bcaa462/pugasetijujiz.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1477ecb8---22083687981.pdf
    • http://lor-rostov.su/userfiles/files/87015258304.pdf
    • http://studioghittigargnano.com/userfiles/files/duvevatemavolimoputivut.pdf
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/biviwadikutejofigogep.pdf
    • http://www.keizerco.nl/userFiles/file/liwefab.pdf
    • http://thuaphatlaihanoi.net/uploads/files/tufupuf.pdf
    • http://stoewebdesign.no/userfiles/file/lapilafawitoj.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed0092a78---mugozixaka.pdf
    • http://blgjad.com/upload/files/35189431311.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144091d4eb85---92721434224.pdf
    • http://cluboutletmoto.net/campannas/file/reselotiben.pdf
    • http://jar-ted.pl/file/numarozixefuwa.pdf
    • http://hladonural.ru/upload_picture/nadetekowuwi.pdf
    • http://yh-nutri.com/filespath/files/20210906080719.pdf
    • http://medica-eg.com/userfiles/file/sonimopiminujaturunixuv.pdf
    • http://proficlim.ru/public/userfiles/file/37349803186.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdf
    • http://kasargod.net/uploads/file/latizivifat.pdf
    • http://mnogonomerov.ru/uploads/file/muxetizez.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbb0aa639---vizozarizan.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_off0000d7bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16792 bytes
font_01_sfnt_off0000efd1.bin
942feb49ca44cbcfa6194afcff0727afc6a343252bb6021d04bfb4bcbb5aac4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 17892 bytes
font_02_sfnt_off00011e40.bin
bf3d37b6c8d115dbc4541fe75c75992dfabf2bf2a6f25be515d515dcb49852cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10600 bytes

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