Malicious PDF — malware analysis report

Static analysis result for SHA-256 0460be28103cf496…

MALICIOUS

PDF

70.7 KB Created: 2021-08-28 02:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78094b358d983fa214d9c84b439e16f7 SHA-1: f178522116685a6e2a5b10073939154665a3a979 SHA-256: 0460be28103cf4968624ceb977d2cf8e44977a24225263265db76fae9dff077b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://dentherapia.hu/files/file/70387535528.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/tujodaf.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/91424834916.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/valegabaloditita.pdfIn PDF document text
    • http://101balkon.ru/upload/files/81434203446.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/zasujatoxijozuzefane.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/47bae6d2db678576b841c64bfa25c86b/vulafalipabolagiwu.pdfIn PDF document text
    • https://migger.dk/userimages/file/29054768639.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/746ca49793fc74c528a0aea2e06c3f4a/dubelurarovesavekegapak.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/9530380647.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/279012135.pdfIn PDF document text
    • http://iltorg.ru/upload/file/memaluwiviloloz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m6dgtrl3u9gl7v0lqbjrh200js/gewemobidadodozusuwakan.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/22541666691.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/95d961c000f0048b4e2e8880a8c843a0/majuxobefiwabiz.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/kinekinavixenapumafaz.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/39al30mks9e94c3n79uthuoqn0/80011570882.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gazoxa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04efc58e0d---31381622397.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74bd37668---32222176273.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc575ebc8---vuwixorezixugema.pdfIn PDF document text
    • https://raljob.com/userfiles/file/98061420298.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/35292041466.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/30692926476.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vazogodilewijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=monthly+work+report+formatPDF 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_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 10648 bytes
SHA-256: 6a504401d53a714454264d5bc814aec43e5c83cc2432b27896497d4a06b61001
font_01_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 14612 bytes
SHA-256: c08f8bb5de327721e28fc6b501b0684a2f11f6b351d07073d72633c203f8a360
font_02_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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