Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e11cb9ca36f9fe…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a52a0c51894ce10beb960b5fe45f8285 SHA-1: 67bc3e5b2c0f0f6ab384a3056473bcc1e0c999ff SHA-256: 09e11cb9ca36f9fe6fb59411c7ee534e654d778f7e341eb4e28eb8ab9b0b7955
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rr4atqsnlocfsndafcqlek7653/87612184002.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080627ded413---39254712983.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8fb9541c---29928056521.pdfIn PDF document text
    • https://ccskin.com/geektic/files/nasud.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/66319449079.pdfIn PDF document text
    • https://rotitelor.com/contents//files/xumuxamijuxumexipina.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/31503151161.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210714_010652.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/rusiwekemizobepakozu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c419876b---mages.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mj59gram1762is9tlkv2qf5mv5/25119551586.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/xamitewodup.pdfIn PDF document text
    • http://skupka23.ru/upload/m/38779339872.pdfIn PDF document text
    • https://parc-hotel.info/file/86483467732.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/zizitexof.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/49737234575.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mimaviparo.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rixugoxigifufagibuzuw.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6670e49e---98443548027.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b173e663b2250d0f5f6549a4d800f9d6/1198463948.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa5d91f12b---rivarixebezog.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/daruvubitajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=trypanosoma+spp+pdfPDF link annotation
    • 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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17820 bytes
SHA-256: 84e86f96d9c7c16bd3f1198611e8a11d0bb12be2c90ac6e3448855ec0df35a88
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10368 bytes
SHA-256: f88757b3bd696f47bb5e1b8a9f80d721c3d03185754133131b72af317e0cc3be
font_02_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1