Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf8ce98d715555…

MALICIOUS

PDF

64.5 KB Created: 2021-06-25 00:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0c5d2171d30039fd0e6da290f27d5c88 SHA-1: 163b70d56a10186af8a0babfc4952d19f29a2a89 SHA-256: 0bbf8ce98d715555b19ddbe9c20e17b2b1ff589208c371e7f83ff8e82db6570e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2fe479a14f247278c16cd92103075382/xomavosetoxezamemaxijas.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a3f0cb6ee1ef27dee8381e06d64eea21/57635696072.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/48505600529.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hdori3im18nfifnqfco2ucvm50/92705550216.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/remod.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6e0aa6a0---ninumawino.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/68866129221.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56156b3b5---69513633210.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/135974c2fb06818564a8f3f9ddbf89df/95291121539.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c03b98cf12b5f18492dc6b6fba98872/tewefadobuvojowopofun.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fobijazosunu.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/zimajelid.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6p8hkprhe4jja3nlqh0ki3ees7/kojupe.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/Om9ozkHLxGw/uplcv?utm_term=soil+science+laboratory+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_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 5292 bytes
SHA-256: fb6c3cd8937f9c91de3f2711e90678175e5254783462ff61977424fe368ae91f
font_01_sfnt_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 10204 bytes
SHA-256: e798168885e1c8397e772c5a3f444ac21a139905e9396f819c5a10dbafb10861

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