Malicious PDF — malware analysis report

Static analysis result for SHA-256 291753ccb39a62af…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 23:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80bc21bf0a530906c396309616a22ff8 SHA-1: 50f13ce23a7ca6b9936626e18bb02caa2fa06afa SHA-256: 291753ccb39a62af4e1bd1590bb36a77910e68901dfc4d827945579bf4664ba8
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=mapa+cusco+pdf PDF link annotation
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/94aac4f240c5ef7b685df9888c55468b/xedagor.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fudatatisowu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0f9a4a784---tirimomoxo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160eda25fdbc16---dofefiduno.pdfIn PDF document text
    • http://brlairport.com/images/file/3323582229.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/xogozuwulezisake.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/fixudokevidowoxeserut.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210716142316.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/329655b2215e9de4d5342537ceed8d4f/74469992780.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/kukodekufiwa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2cb008433320ad3b60c18a3700325f50/xixijazapude.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/watufa.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5b94fd6a---31474820542.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a752f90b8ceed16f6b9ec3e304ef4550/zupagonezomivano.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/48867487397.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d77a92aa2---20475562287.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tivububajekiziluzulegiga.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fa78abf650ef058fb3915152d9af788c/23312495612.pdfIn PDF document text
    • http://amandamaitland.com/images/file/70332715826.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/15127052126.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/lomonidolosomozew.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/75529001687.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/minan.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_off0000bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10132 bytes
SHA-256: 7594546e25ff307fc4a9a40fb43529f8a96a266a35221dab795471a332406adb
font_02_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 17936 bytes
SHA-256: 60e7a94a7660be4042b868ffb6df2538b9242eaff46cd364a73238a656dc1a65

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