Malicious PDF — malware analysis report

Static analysis result for SHA-256 04754ffa2cf37da9…

MALICIOUS

PDF

84.0 KB Created: 2021-06-24 13:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bf84187f62f3aa9a227102ad8becd8be SHA-1: 964fa05bc803ba226fc025c342a4eabd2d84c8ba SHA-256: 04754ffa2cf37da9de1c8926385caff0de399cbabd73e3086f6b869f839f7b85
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the ability to determine specific execution methods.

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e932b74---kisuvudixofenivegomalob.pdf In PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/wezimejanodivaj.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98230d4af---66865595512.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/88559156986.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/giwutofatedofusu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847f4112649---15342658080.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e601e921ec---kazukudetadigojubugiba.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a66052690---noguwiguv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1212277d---60526299289.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/cec1f7011028b5995f85f3cd996998ff/lekugixokudofisof.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7da0b1c63f40b1bae895115e0a9434fd/41457048055.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/rorubipimovutotazivinap.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cee3b393cc0---52732021765.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wezadigonusofuzuden.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/gonalobuwoto.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f6d26582fe4956a02c4e4d976965aa8a/80343397495.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/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=schaub+lorenz+tv+manualPDF 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_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5212 bytes
SHA-256: bd7f31bf4eefabcca06febb138d39b372dd50af12d92bd8e8ebc84a90429b484
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 19556 bytes
SHA-256: 3a649865683632a8765ba5ec18431807ff611d4bd4ac2618013aca06a810d428

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