Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef66c0d604a9c0ec…

MALICIOUS

PDF

78.4 KB Created: 2021-08-28 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3bd3cd72ee0812995f46a36c4e6ebe1e SHA-1: ff7c9576bb049abb38cc729a51482acf76442857 SHA-256: ef66c0d604a9c0ec861b67ff66c28f25f603ec7cc96ef0cdcff757cf39a326d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed to direct users to potentially malicious content, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=pomchi+puppies+for+sale PDF link annotation
    • http://eszixv.hu/ckfinder/userfiles/files/laxarixuk.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/27810516837.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8e02e33372827559069c5889cf003cdd/83037590774.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a3112c62156a8bde5032e2024354af21/26397628561.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/lujoruna.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/forudazugunan.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34911022319.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/diwepinuvugetasazis.pdfIn PDF document text
    • http://dsagco.com/Upload/file/41050798466.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/7224545273.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c4a24ec8087dec63365a64165d27b705/22637817784.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2477876a2ff17403020092a0cef0d531/mulur.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/k6vmj48khmi6o8iac7nep20c24/juvesulajumovuleb.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/05868df2bdb6149be81b35b89a479913/38045171511.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/giniv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30c8360e6---13199840189.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33a11303e---raxatuze.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504143211947386.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/xuzezagu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/wenakufeboxo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c6de1c63---diladulamoxokemelexan.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb095fb5---gifovejusutotazekex.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4f06787a6a8201949d02909dbff77163/xerixidunefisuwetoku.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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10644 bytes
SHA-256: 036d037752450225e8007ca65fb500b87d913986ac22f4aa9398f183fc4a550e
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16952 bytes
SHA-256: d64b744e75ce981cf408eed2a0f9791fbe7ba3637edb9d0fcee51a1652ff6e61
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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