Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe634534e80a4a3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 11:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da063506b548d474c068849f2b627252 SHA-1: d4af97d2a85eeb352409b4b5a974e441304187c1 SHA-256: 8fe634534e80a4a35885fb4bcbe2ca9b35033388066cb8a26fe2fc6376bdebe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=resident+evil+offline+apk PDF link annotation
    • https://clearpatth.com/userfiles/file/supubabuxitoxejozefa.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/povifelotakebivikevavad.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/99507941408.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f18f7df01---gozegezixu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/12319748941.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/ramugokefabozetoperofer.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/5020186155.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/97346920256.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/fojemixukano.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/rovilaliso.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9b8c9e96---jifixixudaditiwasami.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1227119be930cccb1056094fbc4831ca/kawamuwonuburodobebogalu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/56039402177.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/1615185095.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109011754322648.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/notowavepavitojomi.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/rulojivipadowur.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/vipavelojesofedidunubob.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/34954875976.pdfIn PDF document text
    • http://xenangheli.vn/public/files/94795351572.pdfIn PDF document text
    • http://cudicio.it/images/file/61814702375.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/82751647987.pdfIn PDF document text
    • http://kftchem.com/upload/files/fidelalafobud.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/95527533715.pdfIn PDF document text
    • http://swhos.com/upload/files/86506317557.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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10596 bytes
SHA-256: add0e308cdeaab1712f93a94485216eb45a130352adb7d1e0ce80dfc04e058a5
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16900 bytes
SHA-256: 4de934144c7dd043a8b6fd8c237c119f831aad4e484c62640d599bd55fc81e00

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