Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3a463a3a4e0733…

MALICIOUS

PDF

78.4 KB Created: 2021-08-07 03:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fde7c25e89d1de6f7190cd05dbf3ef7 SHA-1: 0b1de245f1d1a8eb3e55c712470cbf9dccd0efd5 SHA-256: dd3a463a3a4e0733d3720509e2754debb00112888e327884d27a6226c1d70786
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to direct users to potentially harmful websites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://torbay.ru/images/uploads/file/36992416524.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/67485356315.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0295ac4b2d5dd04de76de20a2c65f4ae/63204482266.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a723d884b6d---fewazora.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/58478674843.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/49316196147.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8566472e6---newufizobenutilir.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3fdfb2904---suselesoxusutezuxajeguro.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105059e00e06---durapikonavafebuwa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/577c0a31c468c3ae34d4df111850c51d/kugulupakavoxadupa.pdfIn PDF document text
    • https://podimercrm.com/img/files/letinolewivebulupu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e1df78069---1593496505.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wodeluwapunivepo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a13235469c1c00a0c0e262f21f317c4c/zaxixinofodu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c788361b29f---50291578177.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/9182419405.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9ca63fa15eb6cda674a01722a4b52494/47052830317.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c02c7dcb958a90a261f736e2c8ae4081/diduvav.pdfIn PDF document text
    • http://hjhchem.com/upload/files/xekoxo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16104f0b1bdfa3---93275763307.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/95890625631.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/o1om1nc6jl8n8qjkcq0k3nl0r2/zusilix.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a806c2c34a1ba8d5ab54e11ce03e6a9e/sowojovimawapefi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-30/20210630130123342019.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/vevukufajoxurised.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/labipufedegawexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=integrated+chinese+simplified+characters+textbook+level+1+part+1+3rd+editionPDF 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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 16728 bytes
SHA-256: 4314a5c715368ae60a8e3ca10aac1486cb08d0ac84f50068f019b5cfa62526ed
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 11640 bytes
SHA-256: e6776aa0bfbb20d5bcdbe9e317d6acb447fb57f09b569df966183a12b76eea35

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