Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb559a1fe6236bdf…

MALICIOUS

PDF

62.8 KB Created: 2021-06-24 22:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fc92a9bc163f577c7e3c64d248a0eabd SHA-1: c4e35bb26b7c15e5984836677c12c918fa0fd2f3 SHA-256: cb559a1fe6236bdfc714da144c32afe52441333728a75046fd772e6321116c87
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple disposable domains, a common technique for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160955b7eeadfa---5256623167.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf537e2be---31880019303.pdfIn PDF document text
    • http://fedime.org/imagenes/47739333246.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751f3dcb5f8---90932707893.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/pojunepejesozixibodejopuz.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d760e9b66---35791420346.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikupusoxiwosivig.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/21358321372.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/29597925503.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h3mdiu6vdm49r7oj4a221u0o7d/39809924086.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0fea25bdc82ccff72f7ad57a645729b/57293870989.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfadd2efc---bijenisurekudiw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ge0qh0te4llv6fe6o001r8ee6/72741130787.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad0a3d087---suwupevotuwalufurixarug.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/lopikapugewobizew.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce1bcd312---67351317840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=french+in+three+months+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 5108 bytes
SHA-256: 806cfe84fc90969f325c050edf72cf4eef3a7c09c691e570f93caa32745e0079
font_01_sfnt_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 9972 bytes
SHA-256: 602f09eb4f2143b460e8b467a68e2ea9a916f8dddc45f31e6f1e3bb29160db4f

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