Malicious PDF — malware analysis report

Static analysis result for SHA-256 8428e7cf6ddee9c0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 10:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68a2239607dcdb30411cde8d95c8a080 SHA-1: c4eb2ce623f653f386e2989487e58c5c0e6052fe SHA-256: 8428e7cf6ddee9c07e36181b6d9ffa5d551c525e38e6f74211e4cebc0907bd98
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://garglob.ru/uplcv?utm_term=diccionario+de+pronunciacion+en+ingles+pdf PDF link annotation
    • http://paillasse.hu/userfiles/file/42208914429.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/texamokitizavabepe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b04c1202e---sabulerekele.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/4802853207.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/gumiromoxoxidivixabazaj.pdfIn PDF document text
    • http://anupbolivia.com/images/files/1060606426.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0f8184484c756d88bc3fa4ffe99dbc7f/gasowewalaxenasitodisawuj.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/zanekokosiwerowedinejur.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/81706528550.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0a2b3ff5b0af14c30777a1c3bf8f9728/jupuvinenofanulumawe.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tigurirojez.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/roniv.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0edfac5f4d093e74f8477ae591de1a53/94700761143.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/32259977444.pdfIn PDF document text
    • http://youil.org/userData/board/file/xefopetowimabizos.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sibujoni.pdfIn PDF document text
    • https://clinicscrm.com/img/files/folijo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/s405qage9gtlep6i3suku7d0k1/pimuforim.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2b78ba451cc16bb1931132cca0a36e43/85776739283.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d45370185c4f2d86dd8c9545141660e6/zipoludasorititozexade.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/37688622039.pdfIn PDF document text
    • https://glozor.com/userfiles/file/63841878710.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/pixalotivinuxaxapat.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10796 bytes
SHA-256: 55198c94ebc652301ad00e4b59e974f6e90046cb46bcc879ed9e4d0e396a2072
font_02_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 21060 bytes
SHA-256: 74fedd872ff571a732830753ccdf28b2ae354066a6da40344f1b2b45c6b2a793

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