Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cd7986ebde5d86…

MALICIOUS

PDF

78.7 KB Created: 2021-06-21 16:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be5e6f1fe1e8dfc97d331780403983d3 SHA-1: ce1faaaf5d385565ce53c0da7882da13e5b92784 SHA-256: 65cd7986ebde5d866ddf11423e541a03f0ecf5aadfd8b8e1eff8e193bab0d810
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee90fa52ad---jidedafuz.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36eba9b1d4---743800119.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/61509877370.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/9480400426.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/buwifa.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/12f2cd4637cf385d2d375ab7a847001d/91040749410.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/64934175018.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/27126595725.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3f11da2a---7611043317.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd22148e---lovatanu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9089ed7d8d43036f7a0f355f9396800/92711459048.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ku4i3v1ech6jd8hldcnbgad883/79660455423.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5abc4e9cd---72250945895.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/94858194600.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtadqopb8fh886nufm17tiut21/9628659569.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/99125134626.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33050923024.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4fb27aeb1f960267ce4de5238802002e/93238238635.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/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bohemian+rhapsody+sheet+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000113e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113E8 17600 bytes
SHA-256: 30e81ca683084fa71411e0f1fe465aa82c0e4815aaabbcaab8ac2623fb9e4573
font_00_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 5400 bytes
SHA-256: 9f723e81a225d477a2b98be31bb221d477a4be9e5ba26b2452eb63bb102487cb
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10480 bytes
SHA-256: e41d877b3c59dcb03365bb6a4104c337d013ddefcb9f3b6dacee3c054a9f5e07

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