Malicious PDF — malware analysis report

Static analysis result for SHA-256 2963992ba9aecea4…

MALICIOUS

PDF

100.5 KB Created: 2021-06-16 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab0be9bc6a07e40fe8c8696ecd61944c SHA-1: 2907e96bd81b213effbf12f503d4eb7b3f87a978 SHA-256: 2963992ba9aecea4cd666f4c4e94b547dc1cfc60f48c1a249afd514efb9dbd1c
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external websites under the guise of providing free access to "Fruits basket season 2". The ML classifier strongly indicates malicious intent, and the numerous external links, many hosted on compromised CMS uploads or disposable domains, suggest a phishing or malware distribution scheme. No scripts were extracted, but the document's structure and URL patterns are indicative of a common lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=fruits+basket+season+2+watch+free PDF link annotation
    • https://iwnta.com/userfiles/file/74794266811.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j60tmjrjpkgukah71pvd0ve3uf/fenerebomekufu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lh52tmf0re8a6u23q52267vm7r/rikinufepujimosir.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622302234.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160702532bf3f1---nugefetarapeju.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943eabd4cc---xugisopemise.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/mepigesevibesoguz.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/98469904692.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/51e3f95a98ff95487bb7af40c8e58bc6/63443051890.pdfIn PDF document text
    • http://waypl.pl/upload/File/jelaxifezijebusizok.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/2022445849.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b056a013b8---gifakarekatotaxadivaxin.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65682c996---5853248369.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/v1v4o3jav8pf9gf4stkcj1plr7/21303303333.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb1e18770fa1657ab2c5bab88431ac2e/35728260548.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/jubekejubunazini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 4576 bytes
SHA-256: 53862d88c9b48fa4fe5d24c99c6e5b43aea450a3c44cfbd7499f46a6b6c4cc44
font_01_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 5320 bytes
SHA-256: d7f2d9b9af53c31743a2404c2de09c1e84413f433acd3e8cb3814680452dc69c
font_02_sfnt_off00014575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 12012 bytes
SHA-256: e357c0beb98f520b59ec31e9dccf1f57e19e34d10907c31e41649445ddb0ef44
font_03_sfnt_off00016df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF3 16392 bytes
SHA-256: 72fc651aac14538ebdd083b51017c66a372882b36fe5d7dce80651af5ecb0312