Malicious PDF — malware analysis report

Static analysis result for SHA-256 848d58b98add1672…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 05:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed6f838fa4edb9a788681c4957ce43d6 SHA-1: 7855e8c8aa2f8c82b6fe6cb0493fb5613932daaa SHA-256: 848d58b98add16721b5d23d13ed80fa6f06dfb90df1267f963488cce1143c3ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://redac.ch/upload/52051852805.pdf In PDF document text
    • http://e-hematologica.com/users/file/74029734718.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/27143872199.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/xeguxobanoxonum.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/96981540911.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5cd59ddb4---48384684949.pdfIn PDF document text
    • http://labonscafe.com/userfiles/nilozanemojuladoxuzopu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821433e731---weradorerogozorafokog.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16147ba7720627---kulof.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a676b1227---muropunazugelu.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/soberapimonusoren.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/xilodukoxipupopuvavav.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140636a98732---pebilisosasi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1aqnntklh25s90ccadtjk70e46/pazogeg.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/gufemifi.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210904_000833.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/86489631909.pdfIn PDF document text
    • http://abwessex.com/uploads/files/vadizowevabelivewakobik.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210921075416_1347148658.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/lutajobiba.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/roladuzejufileguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=spc+world+express+ltd+appPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10572 bytes
SHA-256: 014a11981e092c8e14c7f49d611866829c69d9f08871ee5a5dc916733d145bd5
font_02_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 19808 bytes
SHA-256: 30c7b210a0dc1e98a7b4e029015954d5104147855ed5fb72e189ea77cb6f4f5f

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