Malicious PDF — malware analysis report

Static analysis result for SHA-256 388f4f4e968f9bae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 07:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2a6a680da839f79db0999f2c52ce240 SHA-1: b077c115a6f600d8f79eb1987c74d4bf950309de SHA-256: 388f4f4e968f9baebedcb9e125e5c055b72334e777d216681fb07a1cf42d9c68
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://flyingcarpetclementines.com/userfiles/files/31171178314.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607544e9bca90---32351160816.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bca40f16---84823767839.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d5c82033---54957076071.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b573dff9c70871c6914f78980034e9c3/lunetilimemadaripu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/17316042642.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/53233858156.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/juxen.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/1953843954.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fedezomokerisolopepag.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/56440904114.pdfIn PDF document text
    • https://rinducm1.com/contents//files/jolufilo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8383295d99ef661ba2298127d3324d14/25170206807.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/fafatavokojuwadolatuwa.pdfIn PDF document text
    • https://bamor.org/userfiles/file/91369760066.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/pukesejesuzefizuporixoso.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5725017296d9e15136574693f65ca518/79394511728.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimamuxesupefajod.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608192ed7ed47---1366589520.pdfIn PDF document text
    • https://wasael.com/userfiles/file/22232684823.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efc3737c2---begogotiwogil.pdfIn PDF document text
    • http://chinalabware.ru/d/files/19686868910.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ffe4ec232765979f7737fdbe9f5c102f/tetinivodiwuv.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/44523065752.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/25698261024.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161289e2d5aa9f---fobemasefanev.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/viranulawugalixos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=inventory+accounting+questions+and+answers+pdfPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 18420 bytes
SHA-256: 9efa15fb0bbd801902130af6df3242ecad9d550bc0aff87e8d3ab890c1dfc2c5
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11212 bytes
SHA-256: e35990ebfaa28df7af1ad2e792e204fe94bb61f9c48ae74de61728a3fd9974e1
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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