Malicious PDF — malware analysis report

Static analysis result for SHA-256 c574a8dda77473e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 19:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6e3693312eb39afb33e99014b5c98b4 SHA-1: 15058ff447c88944239d30faa7c2046e0d611af1 SHA-256: c574a8dda77473e0feb8a12da0687d85c3de79899bc6626487a9b410a46d4dbd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown URLs further supports this, indicating a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edff407cd2---wosidasolozu.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/95503843493.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a326f47228---luwoja.pdfIn PDF document text
    • https://campermagazine.tv/public/file/8841958983.pdfIn PDF document text
    • http://space-edge.com/upload/files/kofuvidagaruxafeli.pdfIn PDF document text
    • http://ahknchem.com/upload/files/10407328793.pdfIn PDF document text
    • https://nomortiga.com/contents/files/50887137419.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9d7b48f4---pixapamulewom.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/74949710932.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/85093415701.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29476637896.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d5a00d98---2772136117.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60858953747.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/32711844478.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daca47cb96---45406865270.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/lakasozesezonebinizadi.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/91274969817.pdfIn PDF document text
    • http://ymmicro.com/files/files/wetaselesoxovitujana.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/zijufejujewabimirujuvo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/32793275930.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad53e94669---13271858662.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bunorupawozotelovo.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/puzudipezukexulok.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/43fe913f5149d0a5b5f4cb0747d1b017/784072959.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/83278621109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+code+for+robuxPDF 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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 17432 bytes
SHA-256: 0f1d188465fba518cc14f8670fa7cc221ebad7aa7a40f4fd5e6426800a89b160
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 10124 bytes
SHA-256: bfe2fdbe4730d07940007fc08cc655a50fe5be3d4faa2c6302f701faffc1ac47

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