Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dee4ee75407b0a5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 10:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3c917f70cd6bb4f5cb284abd8ed7a828 SHA-1: d686b7680cdd478045965c5de64663835c5d4912 SHA-256: 3dee4ee75407b0a51109de84c8fa22b1f271e53c0df81e16ae433c2774c1da20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised websites, likely intended to lure users into clicking malicious links. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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://allytemp.ru/uplcv?utm_term=discursos+de+tito+livio+maquiavelo+pdf PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944463b7580---gelakagowub.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h9c9vt7ps0r3b82n54qt45vfe9/46693130111.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/jodiremejujukava.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/jazanegufumiwezabel.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/81220672608.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/domekazulimozek.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/posd77ngp0rhdgn036mrhn06kn/93665950216.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/44103742020.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106d311a75---46352918634.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2009696beba532bf63b8bf3f5c7938f9/sewuje.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98708523500.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/14861818655.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a822df19932---nexajapawumajadalisa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2997ab0f90---jenadoxazineritirogesifod.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/19992616740.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/varis.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/23009111095.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/13768873484.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608280f3892d2---pavafuwafagozila.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504005724708253.pdfIn PDF document text
    • http://ceroki.com/image/files/vinimafamu.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/57454510262.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/41822617997.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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 16748 bytes
SHA-256: 9907a534174e9f11737054212fa01993f094e98b620cdace3aef2a3f4dc0dbba
font_01_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10988 bytes
SHA-256: b8e86b0f7b211751b4629fd95d1511f97659cab9df1da264f15298f8197fc505
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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