Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2dce5e447b8d42…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 05:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77ff4b3cbb85e56188c31cd581d8dd3c SHA-1: 17c5c2064885af97c87f2926a79beced77ac9d15 SHA-256: 5b2dce5e447b8d42521b4c86efefa82bd21735f9d6fbd7d16c80783c414d54b6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5b0b161f---30329519132.pdf In PDF document text
    • http://www.hydro-tg.pro/upload/file/11961114748.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/gojoraruwazasesotamixo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/867479ed7ee30450b540b19f730af863/xusizonuvofipevi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/30799457009.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/regizosake.pdfIn PDF document text
    • http://trevorhannant.com/raseratamed.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/nureparopewowovamafedika.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecabd3fcd1---gerikujuwejerosobibalere.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/vovakiteneze.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/36568162807.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/21980085264.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f33df1e5---8580446629.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/vulupajoperavexawejusokep.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/98734586771.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102a42ad5cfe---nulunurudibuxo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/op1l0s8mf1023n5qhcsbavnojb/13104870035.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/49950631159.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/furinivuzoxewel.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/vunosoxokoxana.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/jezekefafilej.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/limiwiv.pdfIn PDF document text
    • https://epiphanych.com/images/file/76939800011.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/34267898830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=in+the+shadow+of+the+valley+bobi+connPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/273cc986721fd89cca11b661945c3277/1110855961.pdfIn 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://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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 17868 bytes
SHA-256: f2a1a2f725039a634fbdf91f07d6b9431b5f3b98ae43c84f91082a7576bba308
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10828 bytes
SHA-256: a07864f60369623f2b7aca8674dac464b1624311156294b5ac08ea8f4d7a11cd
font_02_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1