Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd057af57845f4…

MALICIOUS

PDF

81.3 KB Created: 2021-07-12 22:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abf6b463a6b601e72a039043262b35ad SHA-1: fe94f43cd334c86fda3b25382727b75dd5809144 SHA-256: debd057af57845f4e2262346a3b74efd6b400aa2c1ad9ca6ebff39e38c6adeb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the numerous external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ct-tci.com/cttax/userfiles/files/6577405553.pdf
    • http://ncabhsa.com/clients/875427/File/10405376742.pdf
    • http://axiomestates.com/userfiles/file/78631574582.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/88e2fdf3e539041f2f3a7ad6d71849e2/18243993464.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwujemel.pdf
    • http://robalton.es/Albums/images/file///zutasadenedeko.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/bb0755c983d185f8466848c2c52d41b6/pabofopubagafasugubegum.pdf
    • http://timeyear-v.com/userfiles/file/82192198748.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45ff6b3a9---gurogileboxosukumuraz.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tk27o97359ij19ung4r8as3hi5/11924052319.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e07578b6f---pebekozosuxapokebumubuw.pdf
    • http://coinproject.com/userfiles/image/file/vomidugosedo.pdf
    • https://alutat.com/data/file/kesijobovi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1eab822f4---66030775610.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/129f115c8eab61079f7e8b549b854e2d/27542723655.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/11090241122.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/wovatijof.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0e0e419b154592464537d6ce850a1b21/65433416320.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/bexojekiwozilumopawewak.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/kejefukabakobokugagepefi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2425ec24---89890675600.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90c7v9cuck2nhdkkrvic121op3/rolas.pdf
    • http://portalpr-b2b.es/img/user///file/_0744611001624805510.pdf
    • http://kme-kme.cz/files/file/vojomijojogolovag.pdf
    • http://sparkpro.lv/content/file/12446659130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=completing+the+square+algebra+tiles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin
1770d9b4f2aaefd9fa8003c73f4f68ec7a36f3431a52b2014806974d4a9b3c00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 17164 bytes
font_01_sfnt_off00010649.bin
b6e758c37ad632796b5dd48b2f6908b60b41c543e76c7cae052ff505089cff10
pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 11116 bytes
font_02_sfnt_off00011f74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes