Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bb7c196d41b6cd…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 06:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69ece7248f98e75697563e99578f0c28 SHA-1: 1b9b93fe4fa3bea8f89aeb5e7c1a45f0aacf4d37 SHA-256: 29bb7c196d41b6cd6686cfe4f6566d8a759eb048377f975b662c00283bac1d3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=free+robux+and+premium+pred+2021+free+robux PDF link annotation
    • http://archissimo.eu/userfiles/files/vavitudib.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23414174443.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/molerexodexatatubalaja.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2825940482.pdfIn PDF document text
    • http://gdgom.com/upload/file/210914092118132131vrhr7skupp19.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/ruvalonavevod.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/36894280946.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/lixabazupewazukodijebi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/57106969630.pdfIn PDF document text
    • http://liluby.com/upload/file/56300790353.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/76334929131.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/36953841494.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/piterotabukugojix.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7firs0oa1g1eecd7osjk8si821/puwiw.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fewuxuxotokomi.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/lufemegovurabejabef.pdfIn PDF document text
    • http://nova-auto.com/upload/32404889552.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/batosudejanowe.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/82133725406.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367ff67dfce---55500136336.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a0cb7dfa---varawevarazi.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/losikosan.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/90625122624.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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 10960 bytes
SHA-256: 595a4cb9073c404d17c3f51079f706e4e1ea85f58543432fcab7adc84acf1d8c
font_02_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16796 bytes
SHA-256: a0bbe136a9786ed01e2bdf417e1e7c55f76dd17abd461a509d674d1bd73e2560