Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca1c601a83fa086…

MALICIOUS

PDF

87.5 KB Created: 2021-06-01 03:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c418e27a88d29a161a1ed724a015122e SHA-1: db296641041e5bd4eb7a2779a6ada1252ac9b220 SHA-256: 8ca1c601a83fa086627e4baadb7ab62c625748076692897097ed5eb9e007e9af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2d5a0bcd0c1ce8f168c4df53de30a8a5/96349753871.pdf In PDF document text
    • http://volamtuyetthe.com/userfiles/file/44285213852.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1cf368d15ad9a7764d2e8e1d815f23c4/42125439408.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc21ab91d---32196901216.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160961bf600ee1---marunip.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/zisilubidaka.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f35abcb35---bodetofudaruxubudo.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/24979849728.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08da04656---fizuzomuwelot.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af8574f59---2376585286.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160766d7903def---zofajakadapigo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6e4b5e4e---bazej.pdfIn PDF document text
    • https://inncredel.com/uploads/65383964389.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nevudipupunivipuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comunismo+capitalismo+socialismo+diferenciasPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 5208 bytes
SHA-256: 9c3622da6abb6f5a5b56e9965fde25276f5d00f6b72467090e332c6f8e7b6b98
font_01_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 12076 bytes
SHA-256: ffdfb42b9ee4ae32cc6ce7b7100742d47172ae1d5837a5425a9847ef4672c948

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