Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc0f7b3c655964d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 06:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddc8f7650d34c12f6375692cb67dc333 SHA-1: 6c22e77e6bef5d4b3c22004a4f5ff2b9af083e15 SHA-256: cdc0f7b3c655964dfcf0269a47ca2619529adc86fa1e1bd000697ef868854908
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612baf0860838---91831446087.pdf In PDF document text
    • http://tajeer.co/userfiles/file/jusopipekuda.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f9ec7961---87460112544.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ulhuncaij9urdul0i94g29es7t/37141982791.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutekuza.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a785d2e8be0---gijoruwojizofetawu.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/87635158636.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/32454336830.pdfIn PDF document text
    • http://abnicum.ru/files/file/lerujuvefoz.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/vokesepuk.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6b9a84f---faxobefubizekumo.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/33832118670.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lijuluwoxowiragisixogox.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/19338969323.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/pezosewibep.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/77749829541.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc5d425c8---rijobuno.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161243c33c6d97---nekikixulipixopef.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///12212081440.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612652a22fe0e---78951901797.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dacb760c1cc---rijugimas.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfbe24328---paziret.pdfIn PDF document text
    • http://vtaky.sk/media/file/44468855079.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7890383e3bd809fdb78344adf65fdedc/54015112288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=speakout+pre-intermediate+podcast+worksheets+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_off0000b94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 15880 bytes
SHA-256: 16108c3410ffa8bd10d920c98895cf00a81fadf94aff3478a1fb42f0e8ca9c75
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 11224 bytes
SHA-256: 50d6f1767b1c422adda415d09588177dc799c4cc08788be0e27743f73541a4c1

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