Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb6e4c5dde0c6e…

MALICIOUS

PDF

77.0 KB Created: 2021-06-11 01:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5c0fa55779b19177c76051091037e256 SHA-1: e027e1ed528dc2ebc0e3e497467ae1cb61399864 SHA-256: 61cb6e4c5dde0c6ecd96216ee5be90fba521be9243eeb97553c03255a67b506b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

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://crewmak.ru/uplcv?utm_term=solar+and+lunar+eclipse+worksheet+pdf PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a083fcceb7---wujegenewajuzojeroxak.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8fc8e4b2---jovalagu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0t8hs80i65bd0opv774cbtdmql/86486175789.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l73r7ns5acpkvos622g93fa2i8/46492436516.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/71242996078.pdfIn PDF document text
    • http://kelvista.lt/images/files/bunemubupedojinizabubip.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4a3a7ae5---33315623848.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/bibolosabefeb.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac18d814---42704619859.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9pqmc2in31rfq9u2ok8jf7ght/bofajerapupiwelurubogodi.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/gexevepekerujudomejawizi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090223718a4c---1215759346.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/92074977865.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vaxefokigido.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720710bc3eb---tapufok.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/84664612074.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f1b4a9ef---rutofuzidebizejomor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5500 bytes
SHA-256: 5173e1fe616d65b29100a4e98a8dc60904027faf3d605bd680c38586fa9b05e0
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10336 bytes
SHA-256: 25e6252e5a12248fdfa8db340fcc670ea9ad42b266dba1bc36dee0af03df3598