Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bcfadce17b9cbd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-25 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 64843bc253d070ff2721830fb576af4d SHA-1: 9d195db6490989ebe2fcc375501087092046e02c SHA-256: f1bcfadce17b9cbdf112376a5132a5866bd67a0264c5c71bc138368536ea1a39
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 and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary function appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161464de36771d---27473363030.pdf In PDF document text
    • https://dance-lab-new-delhi.com/userfiles/file/gekuragalamasevafi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/91862626985.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ok3erfmn980boi99rkkdesl0cj/15095121574.pdfIn PDF document text
    • https://togeltop.net/contents/files/73273869179.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/25728325991.pdfIn PDF document text
    • http://seamacros.com/upload/file/venawasalimebaw.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7584d7b18---texaduvu.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/43402192538.pdfIn PDF document text
    • http://888chji.com/userfiles/files/wugutebesuk.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/rabugenataboxawidipasaj.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/wifes.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/38450128223.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gaval.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/76625691822.pdfIn PDF document text
    • https://breedlife.com/upload/files/kesamulejom.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e65ac71cde---kunan.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bexuvatexivabi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614886ff0c5d2---68743199100.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/4125530789.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d888d96d56---pezaxorisixobutoxuxunazi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb64e671a---jinezezubofawaka.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/gefeli.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/770i2boc8ltli294l1vrda5n2p/wixamarazetasakogagaf.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210911_025932.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/gafopizenemanerobiwazig.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee3bd299d---lojir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+order+of+things+an+archaeology+of+the+human+sciences+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://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_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 11244 bytes
SHA-256: 012a061dffa10ffe34fa5e27ef20023beedee6c09ee136b6f3500d5e091fdc7e
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 19524 bytes
SHA-256: 478e9d900e49b372b0f0e75c823f75cfd724d933bd4f0b6b4973e96469801348
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1