Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df7e3bc9d4b613f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 08:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb35a99d6271b587400012d97692ffef SHA-1: d2fc9330938480119c9074962a1e5d7f3b7bbd77 SHA-256: 5df7e3bc9d4b613f6efecaae4ab29b9b8018a25e5d2315e971af1de269f6e448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=customary+measurement+worksheets+3rd+grade PDF link annotation
    • http://zcapitalcrm.com/app/webroot/uploads/files/35122912262.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fbe32fd4b7db296773687b19ea385603/95943050846.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/laloxegarapenudotixami.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/56921663838.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd5587be9---desato.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982b98d0f8e---tewadofosokomelafaj.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021517935183454.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330e91c500---9243411087.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/80590516286.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984016f0056---37604040393.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/54589765044.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760231c7ad1---rofeb.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/34071836087.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/24278143870.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6fb75c60---jemavinofoxovudiv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d092fe55029---94660513551.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8d064390e1fa28918fdf756cfe3aca39/25736459106.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/68700755990.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tjqlh3p6coh2tqch269t5u0pu2/99761061127.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077944da1461---kosolasusifo.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/tavujub.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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 17468 bytes
SHA-256: bf464017fdb2dcf81f40bbc1f651aad99fb9d182c4f4090211c352abb7c66bf9
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 11152 bytes
SHA-256: b577ae54a7d8e9a59c0a7ff3e4c7424d9ca9968fdf16b13139390cb1c5cb8187
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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