Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e6a8d33b7f3f0f…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 21:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cb387781cac94ff737424ea309e9343 SHA-1: 49efac09ffd5beac17b56278e5b8f2b90c85c1b8 SHA-256: c3e6a8d33b7f3f0fc58cacd7e0b1faaadd29075c6667c603a26d249999ea82f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing and malware distribution lure. The embedded JavaScript and the presence of numerous external links, many pointing to compromised CMS upload storage, suggest an attempt to redirect users to malicious sites or download further payloads. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates the document's intent is to trick the user into installing unwanted software, likely for credential harvesting or malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akkoryazilim.com/userfiles/file/mipifowubowewexekomok.pdf In PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nusofene.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9f9cc37d---wugigonur.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/24847481402.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/mejijob.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48717530251.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vogezoniga.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29662bff14---josokoxozugar.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d830c2a43d3---26856696700.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2426909190---73212185551.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98ba05bc5---dotut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1e0e074f---30751882042.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/pebilugoberezasororodepa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/s7uaoobe7vdtbuduiuh5tc30pg/sukap.pdfIn PDF document text
    • https://ahha.az/userfiles/file/liladijubunilodirigizofi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ef719f8c2fa40785eaf81e4731bbf9/72329639916.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/312227083757.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/renarowojevugeto.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607717876e972---38506960096.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/15802719083.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/lusukukojavik.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/151876010060894e4602736.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/54783583922.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/76331014858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convert+mp4+to+mkv+with+subtitlesPDF 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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16264 bytes
SHA-256: 24d7893f334f2deaca1ce7a1ab7df744d022536b62bb27789c187bd8d15d1c74
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 10948 bytes
SHA-256: 8205de36477121da6cf51f16c92451fdd1abd18ae0ff446d4fa3b89a9942369e

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