Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb56a931ce0dcb7a…

MALICIOUS

PDF

83.8 KB Created: 2021-06-16 15:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21178acf92a941e05b345c44c1e313f7 SHA-1: 59e12cbe13031d760638275820ca5abc6cdf9e1b SHA-256: fb56a931ce0dcb7a875ca1fb2ce9b1908bde8d3e682b460445aa9eb01c9ae41a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress installations, suggesting an attempt to leverage these sites for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=family+island+farm+adventure+mod+apk
    • https://giustofiori.it/file/gamigovoxew.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ce039d0---xivuxefo.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdf
    • http://doktor-okonski.pl/uploadimg/file/63273610743.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2avi66rr9rro1cag35lfaov6pb/63996937413.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1aeb0debbd3c63e9fe9da0e35399a187/73136859088.pdf
    • https://newtech-utm.pl/userfiles/file/mafogurujulumonetara.pdf
    • https://vieclamkinhdoanh247.com/upload/files/pumubeniwa.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede5ad052c---78268068726.pdf
    • https://twr1115.net/files/fckeditor/file/pepoba.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb95f376a---gasarubipuwugomoborotagik.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8158794b0---vesuni.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/klhintddrc2e39mk0ml9difhc7/56749229213.pdf
    • http://sodrex.pl/userfiles/file/91014042802.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb3.bin
97a4826d9413dfffebcdaa37cf443c4a02fa8cab064d03481826030588dd952c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5368 bytes
font_01_sfnt_off0000fff6.bin
5e4e16f139b0ccf1238c1787f175c7ab93baa5aa61ad263c8410621a2deb7527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 12148 bytes
font_02_sfnt_off00012825.bin
03f9e19dafebc7907863f4e1a5aab45cb07e5f072395ecd2b00cd3f03b44ab6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16900 bytes

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