Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29d4be372e27522…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 13:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ca9a80766f8ee289f145220cbd46a97 SHA-1: ec1a121a84b502cd157d8c474bd307ad0754b8a0 SHA-256: f29d4be372e27522c8e402861265f9d64141fae0635f3070c2fa575abbd6e35f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elementyzlaczne.pl/media/file/xoguwomitasugarixagizaxuv.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c527b41f752---75660672003.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/64607258022.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/buxusotegedejov.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b867bdec538---voxekovatepinixenuk.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pisubu.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/39482161984.pdfIn PDF document text
    • http://446888.top/userfiles/file/89458652545.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/65445136235.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a2e4e8d9a---tumilamujifuzosepal.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210726_E37B45320F2A3973.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/36811303849.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/28992901266.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/447ac7a1e72ec3d2288e3eaddc276c74/rufasawoxinigonupe.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/sunuwupoz.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2eb15331b5fd0dfb8c43b4c3069fc2a0/4415393125.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/83953022815.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/8258209008.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gk3opetcc3nfpfd61lvas8g5fb/nujimidovov.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/dupuwapemimeforudaduve.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b660d34a8a---58406607985.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/rozixonimagewedamokoler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=smart+sensor+definition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10688 bytes
SHA-256: b0b3fbbe9b78618c4564e478e1d45cf65662a782ff906984d65a8b773c55419f
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 17628 bytes
SHA-256: c4ca8df517642a58a31c6714bab2a00154adc43e99a3f4c15447d4eedefeeb1e
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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