Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c59ff688c00ec…

MALICIOUS

PDF

90.4 KB Created: 2021-07-07 16:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5636898b810833675d3510019da63d66 SHA-1: 18f8721f585be72e41298b506e9bddc4ae79d4b4 SHA-256: c83c59ff688c00ec09eb8163ba1ab3ec5e9973abfe6e2764078b784e9b42ae8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link farm behavior align with techniques used to lure users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e77bsvr92s299bfj47budbb6r4/65557524761.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd19ad9c43---bezuw.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33666323526.pdfIn PDF document text
    • http://laduses.nl/image/file/kejobik.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e96d20fa1---bubipini.pdfIn PDF document text
    • http://alkanboya.com/files/file///87609539053.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607603bca8ca8---87262596147.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/jobazuzififazutuluse.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/us0lpdsq6ns37ltqgntm2e3boe/porugebuxomimar.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5de067d4cf24eb4c8ca5e758a92d272d/26937864472.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/sabovivixalezumutexan.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1d391849e84295724c34a889b57fe267/21989881106.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/27244711107.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/jusirezoxozamusubew.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tamawiwa.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/22852345587.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/383a26b84665db5d6f1404b503ed2d45/38779648383.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sibawagimolorufuwujaz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5h8gbuaa7986m2vunfmajbama2/xafumegizovujasefemizevo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f72b512b---nefuwivusumejox.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a73b6823ba718490d18908f11025de6/59600639068.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3de80ebd---tobilutumijuzetoloka.pdfIn PDF document text
    • http://simonide.org/userfiles/file/56615693377.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b5c03bd---94187302992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=miss+my+college+days+songPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 17440 bytes
SHA-256: 46a38c6e74ff4a4f26462aefb4209176b9d5f3bc032f8a1bd95019591055ec00
font_02_sfnt_off00014487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14487 10620 bytes
SHA-256: 0e3414f66d8c7fc24ab1b73a188e3875a6040dfa7310153e2db9c8ed3358368c

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