Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da6a501c0f3e187…

MALICIOUS

PDF

70.2 KB Created: 2021-06-24 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61b7eb7f046738c9e166c80b027f4b3c SHA-1: b30d42b612322966cd3e2fcd76e9d64d54e5414d SHA-256: 3da6a501c0f3e187162852b4943957ef8d2f86e9d844c4fa545b30b826af53e8
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed for SEO manipulation and potentially malware distribution.

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 https://irlanc.ru/uplcv?utm_term=yeimy+lizeth+silvestre PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce61daea52---67602760776.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094abdbaf98e---70808861379.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/78734567842.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efdb1453e---lilap.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b615d65bee8---21273493895.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/k81m5sssg409sb3ncn8inepmr5/83233930390.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/622384e825f1e77bbc30878ff2298d52/sazapetabafigujebase.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/69ba411e71ad651d1263d94f88343851/46573717946.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21361c79---28291682240.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab2daa81e---jitazejigiso.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28c0c1fab---jabafu.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/xozudugimepulepufejom.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cea257ee180---81573830624.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mugopol.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/98776573623.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/jisokekusabivufap.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 4888 bytes
SHA-256: f8f3cb94cdb9fc1ee3b410cc53512888484b3e4bd3c9633a2436bca252627d21
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 13204 bytes
SHA-256: 34ac702426e220836a8f0b3b766ccd514edb1c51e569c267eb8d16c3c1e98133