Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb21c18c16e63e7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 08:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96146c951c3cf4ccc57c827cbfa6e202 SHA-1: 509c9c08b5198eb60017470ce1bfe67cc5c539d0 SHA-256: bfb21c18c16e63e7b914e295788b8f64325ac3226109f4eb5bb08d3daa36195b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristics indicate a link farm designed to direct users to potentially malicious content, consistent with phishing or SEO-based malicious distribution. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=lista+de+adjetivos+posesivos+en+ingles+pdf PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dinukibusitaxumebuxar.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wixazonidomaf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fe09dc1e---rabujasa.pdfIn PDF document text
    • https://laps.pl/userfiles/file/kukizuviwurasuzogol.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/wobokuwokiji.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b374442e23a---17153173327.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c516b4414be---20727126105.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe40fdffb7---90438255616.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/320fc26d244f88f710a023588ff56b02/27920300057.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d04e3f2b59024712c85d70661adaada8/86033910179.pdfIn PDF document text
    • http://salt17.com/userfiles/files/tolaworododutureme.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/42652216180.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/8748783689.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/burukedefuvixidifa.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/15968350623.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/voropowakutanevogiwapi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/xotiluril.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e7734a24---8862267887.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84585b73---10238395047.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/muzexikadaworafosokez.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/pubedobufosilubobepib.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/39194243141.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92ae6a4eaf---36830763407.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zowekalofoduzevesibid.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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 16096 bytes
SHA-256: 4b77c3f25f65305c6e84c8696b68ce0c75b39f4192459f195f6d43594311769b
font_02_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10724 bytes
SHA-256: 1c34e50d651f948f8198295b8169723eed87e948601f377679e0393fe1c3ffcf

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