Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd29c68f1eec6451…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 02:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa4ad2a51e0255029386cabd7c379233 SHA-1: cd61bb6b3e0ef60c09d408c4ceb6b837083d3c1b SHA-256: dd29c68f1eec6451b6e6e40a527193869506f98d22ea70111e948860399407fe
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed as a link farm to distribute traffic to potentially malicious or compromised external resources. No scripts were extracted, limiting the analysis of direct payload execution from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=use+of+carboxymethylcellulose+eye+drops PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a4e2a60c---68750445313.pdfIn PDF document text
    • https://udruga-invalida.hr/files/47156122860.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/buzofoxodibatude.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/modidefujadarozoraj.pdfIn PDF document text
    • https://cmf8.ir/data/file/komexebo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/snser0famjoiih49uvjtsg7lsp/80400299687.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/irvlsrkrc8a8bsvi2tbd3imt70/17328201068.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/rurobuvoz.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/novarutuletopoj.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/boveguxejebug.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/tadumexusap.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/89727003650.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/64421745381.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/57923418207.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717bb97c4f8---85118189138.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893cd3a82c---jipasizub.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/nebonajotajudugogalalul.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/bobabowogor.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/365523db50f1b4b3397eb722252e40e0/11696073747.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/96272873443.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d4ab9053---60939663207.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/25018268145.pdfIn 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://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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 11152 bytes
SHA-256: 5a110b03a0afa09ddb661b35599af6ffd587a6a62cba4b79ccbd6bc488548d57
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 18020 bytes
SHA-256: 380922873e331df6d3b78d28491ef720b9805220a14102b01f5643234fd54f58