Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc0a9c8fe0f0e07…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 11:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce6fa368e5994ee4db02508dcb24aae6 SHA-1: 160f9ec67d0f87a528b3f46f37b8fbc3a120ad3b SHA-256: 8fc0a9c8fe0f0e072158ea705512e974b051c66a5172ed9ed660951565a50513
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 and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.995817 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=familia+liliaceae+pdf PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609718fde83cc---61625997348.pdfIn PDF document text
    • https://medpressa.ru/files/file/gekeboxowiboxexosigisew.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9ccc6f802---91091968970.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/33849286126.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/tuduvisope.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/84d3d0e63144059d7e94574caff35b30/linezusofisar.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/wopifovupom.pdfIn PDF document text
    • https://langumeistras.lt/i/File/92477628887.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd5b207f2---patewinimunuxuvem.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/17246589804.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/47395106138.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/o1ip7pltlnghklc8j2o7650rl6/tutobotunamuzeg.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/kaxuxilikokopexijewi.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/kazukaxanovipisetixixujo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ce2dea0dc1e4761a2f0ffee1c2bdb003/45538947860.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/61318036269.pdfIn PDF document text
    • http://www.polni.si/Images/files/33141558675.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4eb41bb4f951891355ba7add3751e388/92105359988.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/h08idoon3t03pt61896m0crjv3/84174002376.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9df1c28f32e690cf5041478294568990/20569952501.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/gosene.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb4365499---guzeduse.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/xefazexufozutetevoraxe.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_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 19136 bytes
SHA-256: 8897a22c719a41bc692f21c843e763a957e8b7433c4e1135ab6816f34bc4c2bd
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 10168 bytes
SHA-256: 97bf6f7d1c67d9e70272bd6e18d411f9152176b6c0f1bbbcc158bed7699e2de5

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