Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb4ca1644ff5f6…

MALICIOUS

PDF

84.1 KB Created: 2021-10-21 00:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 013758ddae33616954ce8b85edc65ed2 SHA-1: 7d6b1ef0a55b922cf2823a0a3205ede387fa76b5 SHA-256: f5eb4ca1644ff5f6dfc56c263159de2f1856d6f921ef5c8c2505fd7e8764e05b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV heuristic firings strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://shamayachts.com/upload/file/46056531312.pdf In PDF document text
    • http://kurier48.pl/files/userfiles/file/gebuf.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/lilefoninev.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/xafevi.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/19355587475.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012609f02a---setowezevur.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/wexopiladu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/lunumazuwefer.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/3720342171.pdfIn PDF document text
    • http://pvvc.cz/files/60629841021.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/nawukaja.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badinafusapozopugujodebu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/mafosisifomarok.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/40719759217.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/71862721584.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/filivuzerupuru.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/32148868346.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/nafufut.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210923082923_5s064l.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/gexezepufunog.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14787267343.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d3de79162---2113477680.pdfIn PDF document text
    • https://mindtrainingsystems.com/userfiles/file/xujesitemijalosidamidodi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/waxipuporigesijedikexe.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/levavakadigexurupida.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ec4md8i4ivcl7qttmf5jl9eepg/jotamebugirojuxiw.pdfIn PDF document text
    • http://shesob.com/file/files/mazikatedetiwodesezajowol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=this+is+how+we+do+it+all+nightPDF 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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10476 bytes
SHA-256: 69fa929bd9f87515fb3d42fa2564410d9795653a52f74d3a06fa2c0a9a5a755e
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 18572 bytes
SHA-256: 9ef81c813f9ac11789e85ac71479f2b87edc273adea5143c8a59d2c095d90eaf
font_02_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1