Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9b4c67320fc975…

MALICIOUS

PDF

86.3 KB Created: 2021-08-06 17:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37433e72db18a4ea5fbc2f99cdbb366f SHA-1: 545d42636d49927a70e2c59a873f36dad92331f0 SHA-256: 6e9b4c67320fc975f5b4381aaac172d9a6a2d3d3d0bd9411ccf8d12bffd4f13a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to redirect users to phishing sites or download further malware. The presence of multiple external URIs and a link farm structure strongly suggests a social engineering or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc5147611---fajivovigepuval.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/16185888283.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/sitowabaluwazopuv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a3314417124f03cec8d1b50a8e5ecd23/didemedo.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/44548992648.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/9317179824.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4mucfo4im1jjr9m3scir6k0h7m/rarixowozepijuzigav.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/87131069299.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492aac3503---buvavigologiliko.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/jafigexununire.pdfIn PDF document text
    • https://coffotea.com/uploads//files/202108060705103605.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/61662218396.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/l2qjla3v85sg7vkt4ekjiprp5j/berefozilumefizov.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f260e3d01---godirovuxaletasawebovekug.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ecf9d55c3---nisifotetekipapof.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8af7ab4c---76754449722.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/37766111976.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kepekeputajokibututu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/16680048482.pdfIn PDF document text
    • http://nensi.si/upload/file/79520567266.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/55916271198.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/97106031238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+sensitivity+for+gyroscope+pubg+mobilePDF 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_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 11136 bytes
SHA-256: 4aba53c49609c7df36acfbc3a27e5c5e7bb9659cc646e5b6d361a3fce47e100e
font_02_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 16364 bytes
SHA-256: 6c30f16780026ee8d0abe8b4b3130fa10295c4b9cbdc0a0fa0c80a3926f5e639

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