Malicious PDF — malware analysis report

Static analysis result for SHA-256 96021b558beb2caa…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 02:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c14216b997dce1c331edafddd90d4a2 SHA-1: 6fbd875e194311fc2e634f0b2439b9c3649383e2 SHA-256: 96021b558beb2caaefb8ccea095d1d5e96a025c17964cdae9bca4d0d63cabd2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://rent-1.es/ckfinder/userfiles/files/93893936255.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/98743983924.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/bolujivuwubidojo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13153c394---88985719710.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/70145160536.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/792d32751743a5d7f0beafefdeddc172/wexij.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/76047833154.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/96621101552.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/vazenerobogoxa.pdfIn PDF document text
    • http://groupkaishan.com/d/files/zidazebajeposiva.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/65916233312.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vikubopixebevutefid.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce04cf47a05---55987106757.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160914b1f20a3e---17468912397.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/niramovuwaniri.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ff59dd13---bevodapinob.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a3028ca4d9c1991061ccd6ae5235ab4f/5865104093.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/64300069707.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wopagapejur.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/69608364902.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/13738863798.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fvu0udf8g92lhnjttk8hvjo2tu/47791519205.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/59056066933.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cda63c3d06e---65862039036.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/30089569786.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fasoxer.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/44484407156.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a708a8fe---lojavudokuzijudisabim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=colors+of+the+wind+piano+pdf+freePDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10712 bytes
SHA-256: feed0990d935d57e51c684c11b25ebad317e4f0b9e95e188c237124fc094b063
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 17108 bytes
SHA-256: 92932c180496e6f0afea8b6a46a08d7bf5a4ea1129d3883ce339b24922eb4836

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