Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cc6fb2fc0100bc…

MALICIOUS

PDF

100.9 KB Created: 2021-09-08 00:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb22336bd80212eaac22868311d72dce SHA-1: 2c377033f7fb26c9d05fc57273fc1c24c04564b2 SHA-256: 40cc6fb2fc0100bc499073fbaf804e7f52030b0263090daf773e72ca084395e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 https://krisoc.ru/uplcv?utm_term=adolescent+reproductive+health+services+pdf PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610472432b96f---mufanozevogifemusozoxup.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/35258553182.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f1d203456---65255974589.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0070198f3b---jemujegodofupanorog.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/femixija.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7da4dc3b---mevaguxipu.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/25946552294.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/53363152908.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/81693863798.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cef4d03e---36186541103.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/dazumezebit.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/88cc0ffc607cebe3464e3dc18fb1afd2/toviwisorajepise.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/zenikududokilizunaz.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nazemoxisowamifixubilo.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/bejixodedofe.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/baziwofiromimonoditubosuz.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/dabejexozoxulirebupagon.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/wexas.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/82307924618.pdfIn PDF document text
    • http://learningkey.org/userfiles/99814903421.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/lapasemujiniwogepokas.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ce99655c5e1276db6b7573581683e734/77979787116.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/11886720598.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/povorugapidotijalixizebal.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/78413961703.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77369a78b---69406396337.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_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10864 bytes
SHA-256: 9d45af763f4d3bc556a65845aa693a6299959d58b85f067fde9cedcb8f8b5d23
font_01_sfnt_off000140c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 17428 bytes
SHA-256: 85ff03a963bd90d5fff73fe57fbbc328ee7b21d9393ce06f7f36afa83c783bd7

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