Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c9643241d12169…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 14:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4722dec92a49b2668b143a053f204536 SHA-1: 9208a5f08f9c848134135943b89f8138382e6c43 SHA-256: 48c9643241d12169a49a36118685a4556ca6fcb11e58f5fb6ea7d3dbc96501c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://norservis.cz/files/files/nefabir.pdf In PDF document text
    • http://prime42.ru/userfiles/files/kejaboxebufem.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09498e0c8---70073282930.pdfIn PDF document text
    • https://negaratoto.com/contents/files/27061493369.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/73739735985.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f832e9650---82369605523.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/tegisugarasi.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/73543449067.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/linokanosefokegegelu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/vutibajawofitotanodizore.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/joberu.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/24638066771.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/48341801509.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802bfff182a---junonemi.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mitewubofujosuferera.pdfIn PDF document text
    • http://sdds.be/userfiles/file/serezupimadamipuxopafupub.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/02a635ba81405b32cfd04314d92da408/29020240373.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2085d2235c36dc7bd1d1be036d4fb60c/bowutoremuporuvetodareded.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42c3b75b---89835870755.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/fuwafomo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/27399586585.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c7df3f---57359019901.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107261737473572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=frigidaire+freezer+fffh20f2qwc+manualPDF 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_off0000ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5B 11148 bytes
SHA-256: 7658e4a642b58235fb1e6ac4c4d266a4f16283e281dbe106a1ffa27ecb28dce5
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16808 bytes
SHA-256: eb1a48b1b62b93e17c84098876210fbf3df79bb1d16ec0deddc2fa156ae4ea60

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