Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1316eaa5283c13…

MALICIOUS

PDF

70.6 KB Created: 2021-06-13 03:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b52eae0135f61c7aab497e02de22c514 SHA-1: 07ef45612eb4d3975fa757acb7cb40990f3a34a1 SHA-256: 9a1316eaa5283c139fb655dd8ebced9105e9e3ef6e6a98769d8bdd4e6bc27904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the PDF structure strongly indicate an attempt to redirect users to malicious 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=semi+batch+reactor+pdf PDF link annotation
    • http://oishisushigd.com/uploads/files/5782600761.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e7d7bd6f---rozasumo.pdfIn PDF document text
    • http://capri.lt/userfiles/files/63615551773.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609578bd65e15---bivera.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a29efb692ba---rifumosujumitif.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cad72e2d6---26906763527.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed38680ed---75108894356.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/lifovokosafajezada.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/40958303761.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/32570568269.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/11417905365.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rv7d77koku239g01vjmkobk1k6/lexizosedav.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/xelivobawepetefim.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/000e35910dbb4a14a91c1c1ce9e5806b/kuzimafagodeduzotelaz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6483c6af3c---15351676424.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rinivejazegarerigisaxu.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5428 bytes
SHA-256: 79289a0b74f05892e1d5cc7d94f195b006a75287831cb62e32151338d56c98b4
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 11348 bytes
SHA-256: 605cbee3b8e0f1244a11c134f0f01154724a3334bd131fb366e0d858f562d92b

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