Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74769ed80aabb9f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-18 16:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f7080958ff6ac4319f5620392eba0cc SHA-1: f42afed79cd278cc238a2c40c203f1b9586831af SHA-256: e74769ed80aabb9fe83bea1bbbf0bd3e7da3685105448a8f1b205a0fbaf3d137
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the structure suggests it's designed to host or link to further malicious payloads.

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9419172d1e0b3675a21157e50cd7330b/70295771089.pdf In PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jipasutijazasebanorutizir.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/vujoborikagotuni.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5cba71ea15db004768917688d7ef85ad/gobukikewogipafi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fe982d6b---repakamavigixoki.pdfIn PDF document text
    • http://dnepropress.net/files/file/nujeregirusagunukige.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ph1cl5hjd2dols7rnl7upqngc6/pebaviwoniruxut.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/xefukajedejifilik.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2823e8f82c---gedewasozixuf.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/22992300372.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087423bcf394---nuwav.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4ec19b09---jujexa.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/BkSY9tpko7c/uplcv?utm_term=irwin+shaw+the+girls+in+their+summer+dressesPDF 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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 5268 bytes
SHA-256: 91c1b3df58ccf62c581e82aa84ee2d3814da1c80a05e10b8b88ab3222b9a6f7a
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 10200 bytes
SHA-256: c8f646a2eff386f53057d58e277f9b8004ecb910444bff3139c7959df5184ace

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