Malicious PDF — malware analysis report

Static analysis result for SHA-256 a929dcc59e486deb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 461db35758cdcf339a715ba04fb7ae8b SHA-1: 2d221b762edc9272145ee53ce9c9326b37033a47 SHA-256: a929dcc59e486deba57e1bb38829c43148a4ccac75357f5fe48d234f6ba6c942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=taylor+hobson+talysurf+pdf PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/erhbpvuutpsu50mct39dfu0b46/lanekomo.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/37593933961.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2085733445.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24ebb6d1c---nuzexojusuvumegedud.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608807303c357---1455199568.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/5652977947.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/1539616150.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/7502571011.pdfIn PDF document text
    • http://davcpundri.com/css/file/49711673107.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210707_90F2DCB8B7E02079.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/daeb746aac1c0683c60aa266c0c793d3/40505016243.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f5e24664c164ef487f6e051a29da71a/laxotemebusoda.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/durebuvujosawarupademode.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/botenoloj.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/68835616062.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/l5a290aem2km7p456utca6k4e7/91857133998.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gafuvu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f07b48045---dobeduwon.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1f0fb97fae5b788435a9d5d4e626ac35/60177735735.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/duvimunemop.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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 10688 bytes
SHA-256: f723d31663e39529c7dbb7b3e5e22d1ea344cabdaa7257a953d9d11affc007ef
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 17304 bytes
SHA-256: ae6d71f8c248ba66644afb0ce18e963d0982c7c17ae3e3e5c71caa3175d52b32
font_02_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1