Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c821f005e1f2d9d…

MALICIOUS

PDF

67.9 KB Created: 2021-05-20 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d34bf42ea576aa04f9860c8199e9a73 SHA-1: 78eab3e0b99fd84da7916d32ddb9c59aa787b26f SHA-256: 0c821f005e1f2d9d0fcb4282767afa4b77b2113ed1b73a0f935fc5c52d601d23
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a query about unit conversion, which is likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=cuanto+es+dos+kilos+y+medio+en+libras
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607248e00b5e5---tagasinuwiburazuwurikoli.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b708fac1---bewijo.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f286101674---zebajupoduzog.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e6c39bda8faf0b93b69a0a4136c2e26f/jorojanopabezifuliko.pdf
    • https://grandplaza.bg/uploads/assets/file/nidibenuxamesavobipowan.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1nuqjfileau1jt5rss30p8a6e/zamutebu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a621f3e5d5e---71642057110.pdf
    • http://copy2d.com/ftp/image/file/99296221625.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22df0d5ef---potixak.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addc24d8a6---fovimomuxudobavure.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/37f53d1225f7926b39d0ff1a77831f6a/taninijuxizivewesaju.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vhe8r3aah8f0g5j3qcqi4kv3f0/42850133458.pdf
    • http://rolmech-strzelno.pl/Upload/file/3459036567.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e86983d06eebd0b754b2695014952f33/68360290611.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae769f689---jelarokerisidolovit.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0c869e73---15005310141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd7.bin
ec8de68f6fb9c1a2769a036fd20f01c8d6ce430a115da18ed520b18aa47b3cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5184 bytes
font_01_sfnt_off0000de65.bin
1b189db5eaef9833d27f80df862da6cfaf709742cbe3fd56f3344c1adbe528a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10828 bytes

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