Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35747623d620fbb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fa2115202a027fd6b71a7b3a540413c SHA-1: d94a9afad75310648adf5c80ff7fa826773a6115 SHA-256: e35747623d620fbb29110d7aa169323848c177fb5368a734df7a2d514ea17779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attack pattern designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://sensiblemachines.com/ckfinder/core/connector/php/files/11785544830.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/72743353433.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/nowanofutofejalas.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36902915630.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/a8e86eccade72e26563bb1e9181a1a52/99127890143.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6090cd6a0---35997267644.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3c77422164ac1d067fd4851d7442619/jiweziditibofu.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/kevikasebunen.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ee687e3c7b9ef0f0674b4efbc19e8935/42607247960.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/b2uleh5tiobdah5todf2g2fsl1/rigutavoxuwisu.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/93273165894.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfd137080---voweguzebaxasukaxagox.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f7f08d7f---26329704971.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dff8aea85---kadalopurodebigibo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf686b5e4---romepoxelinadi.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/de8d18c6c4fce7aa725184301a57cdb7/xafuposubemedidikanaxod.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/wodavevetedud.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d61aecd0ab9---26024096138.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d5441c31---kanowipuwuxajonorof.pdfIn PDF document text
    • https://linardi.ru/files/file/36360381309.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/widororanajoxawekupebowum.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jazolulusakawovevaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dork+diaries+download+pdfPDF 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_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 17148 bytes
SHA-256: 3e47a6010421a7ee118cbd20728d65c8f05b6ddebc91240f3e219fd70407bc0a
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10572 bytes
SHA-256: 73539f838588acbfc6c784f5eb5e91b775ca91d2ca59ae8722f40dcbbf3f9a1c

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