Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ecf091a28fedb2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18f254dd7d22edcf80a1b13837e869c9 SHA-1: bb3ac4119ce9a023cf7d0e472e4faf5cb196784f SHA-256: 04ecf091a28fedb2b23969fc556d555579b5e9f3e812a2f70c4d17790bfca6b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://photojet.bg/userfiles/file/wozixopinowizewaf.pdf In PDF document text
    • https://gsm.company/ckfinder/userfiles/files/46565782195.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/34347714318.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-19/20210719014915182007.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/kozorifefufekos.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24840d8b9---10422542666.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d3dea2e9---79295821973.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9981b5a4c4---kowufexogibojel.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4hohr968l7sq7vs6v74hnt8o5/tagutolonikal.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/92988428984.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/sigutabakugeraviru.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904090413.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a327c4dfc---karefeked.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d6797bd4b0a1c16a20669698c070d8a7/32743803724.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/20759526859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70f2e48b0---95338063143.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xikofijopibigapiz.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/5142753391.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/guwipolizovubavunu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e5fbc55a3c8105275c42810e49f2b26d/60215498793.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eade9dc8a7---71286753382.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/foxukakadubasum.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d12cd4849---pudiworetodotexoguden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=converter+documento+pdf+em+excel+onlinePDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 17904 bytes
SHA-256: 228384c68bb766103a19c83c86d8bef6d4ce9ed5d56bebd5ef0c900268e73406
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 10752 bytes
SHA-256: bbc93f908d58ac6c0d801920dcdffa2a4167418c62cfa6344e4c397022ae1e12

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