Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6f89fc3688c268…

MALICIOUS

PDF

119.2 KB Created: 2021-09-07 22:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9eafe95d015dc99068c874f784475dda SHA-1: 127e2317b906a9db6b50d4ba683d5f33b9f6aa52 SHA-256: 6c6f89fc3688c2680d7fba4a29a3a44687a386474fe28fa418c584d75759c9a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. While no scripts were directly extracted, the structure and heuristic firings point to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://xo-sound.ru/userfiles/file/11390590845.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/wedirenizulifemuwa.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/bajijofakalazajepodelowu.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/72231576127.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/napikelibagezuloxapem.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161291a13da995---25541201190.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210807_D3FC309D83CCB42D.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/75708921166.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wemedagutewo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20242b37c7---70690617178.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/24c0057b6054b66b9b18257ec9bff435/koladabeligiwok.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085edf8a7f12---zimem.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/4963570283.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/bevigafusazedezaruzexu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612399c963d5c---71640897463.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0622e34a---tefebifitiripujitu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/57331468646.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/patazeribonulu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/23085598309.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/20498575039.pdfIn PDF document text
    • https://marosme.ro/hirek/file/gobax.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ebe53933---11212257125.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/67317394136.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bcf2465835e3c72a2af3c71f08aa55ff/17302890108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vita+di+galileo+bertolt+brecht+pdfPDF 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_off0001635b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1635B 10736 bytes
SHA-256: a2f81842b79375321433f4afb4bfbe0684a0055d81b71f86aa203742b24295af
font_01_sfnt_off00017bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAE 23016 bytes
SHA-256: 75ebf8bb0eb83b4a7a56f1a5975e42a38090357623e9cc27b96024adf0ebea5a
font_02_sfnt_off0001b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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