Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c91abe5e4e4eb…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 20:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f7ece3022edcd492cdd899c507efd37 SHA-1: f69f7f7f1fec694510eb844aa1b4c9caddf069a3 SHA-256: 8c5c91abe5e4e4eb0ffcedf2e6375ce6df980e5a750c51e152a2eb713e727e39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to mislead users. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=download+mobo+player PDF link annotation
    • http://studiotecnicoligioni.com/userfiles/files/15134261267.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/zodozafusarexasopajobuvob.pdfIn PDF document text
    • http://jarosi.hu/files/file/54256645309.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/poduno.pdfIn PDF document text
    • http://wamer.org/userfiles/file/toxopemorafojeni.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/12830171446.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/66587014239.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/toxavuwob.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6cba6db13---76239288648.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/gesow.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/73362971576.pdfIn PDF document text
    • https://serka.com/serka/upload/files/vivojuniwolajajud.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/34992367406.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f71e17101---likemimenido.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9122537650.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/19399775444.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/pinezos.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0a7dc831---bovofududa.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/89448927989.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/gelasa.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/26726294140.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/30660043386.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/99b74gc2u4feaut9ud2af2brl9/69314786110.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/87641536776.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/moxepiveworoxavobetoduris.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 10536 bytes
SHA-256: 0e36f6fd92fe304bc8696857d7899d5025e4c05fa4b3204fffa1a84079591994
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 21764 bytes
SHA-256: 3d8dd3ab40df7bc9feeb61e047234f97d99ff9a9f1edc7d27eb453fb4fa82171

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