Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b6a1ffcc45bdf8…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 03:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8d8e7c43b1846e3fbf9a2e67e495443 SHA-1: ade4109c597119eec944ac2ae201eb23d26ed292 SHA-256: 91b6a1ffcc45bdf84ac69b9df7a1135f8c264472dc3c9bbcb4e51a3f879e4643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of malicious intent. The primary attack pattern involves directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a878a57143c---badirawibabesasu.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb09a7b7f5f---18616089853.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b9c83aa2426f89daa5d2e7b13c071f31/pikotapozuranodusajaf.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bfe8d4dcd---puxafafaduwapike.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/42075727847.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/42804abf465d35a51b09ddfc132a2dd9/rimilejedofiwatem.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160942012d8e61---tosulerakirugejidoregud.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/64450632545.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/jufuxoxolif.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/985b9cf42be01056bdcd740af3f2023e/topawamufezunodudemiteto.pdfIn PDF document text
    • http://davcpundri.com/css/file/sijidezefabavoje.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/12303496665.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/ropukanabefef.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/vrku90a8c5biataqkr2c5crba2/84653706872.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/82743405503.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b096e0fd---24901056020.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949ce8e9d86---11445282849.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tibevusoko.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d171e2d1---78604828730.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210527205053.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/2105160429439293809zdcd0f15lzg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=general+ledger+interview+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10860 bytes
SHA-256: ab1790d6b393b1fb01fdecd950d145400cf72fbeca8cc7ee8ebdecbf6e7293c6
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_02_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 17152 bytes
SHA-256: 0e40b8c2d080dfabfc3c3fe3ab17f705970ef8f4b2886b64f554a07e0f999ba8

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