Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c85369792577e6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 03:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 843309b158addd05116bad265db2deea SHA-1: 766b668973187a8bf9accf36c809fa68ca831930 SHA-256: d8c85369792577e6722f4b59e8ce9546704b315e402b07386f00d0a519a5885b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains an embedded JavaScript stream and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. The primary attack pattern appears to be luring users through a malicious document, likely via spearphishing, to a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://yuhongzg.com/d/files/jefaniwevonorowipemupi.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00094ad4c5---kutavoju.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9fd7f2657eec4102788f096f52c34ab7/59234438966.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jesumakebakomuxosudodi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b06256a519e---6204157691.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/dakodovarubapojobabafapep.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/482431c72a78b31c7dd84ee474d44a3f/11873173893.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6b586c45---96847816709.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/feroba.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/xudetojanip.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/940023f1a993a9a10c4a83c4ea4a0ae7/43436223492.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/panojom.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6e20dc4f---suxudibogonobumamolizotir.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vrjpv4csa9gr9lpcj4afm0dcq0/70259784785.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/silufufafudefatexozutu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55095842f4---42685334452.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/98bc76202a4484b1d2c12caa0f5f48de/xixetavijiner.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/46344880872.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc31d0d15---jotidexakot.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c138946a73a78685cdba2f0599730a0/poxufug.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/kajimekoloxe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1qmtjjkml46boae6je2eo8q94q/webupavajurusakatuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sony+mds+je510+user+manualPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 17544 bytes
SHA-256: 3ddcb8d81c9e846a51f75b7e2d18f9187821f492e79aec928278998ed4677d58
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 10948 bytes
SHA-256: a7f79bd23d2e77248e3f27ac2261e11fd09039f9b8775e839c0c4b9f34691601

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