Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ec6469748c9596…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 01:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33fd9f6b4d79a04221f86c7b360399fd SHA-1: 49319046cb920510fb66b48c2c12e809a20d4d60 SHA-256: b7ec6469748c9596fde5e7238a3e655e094164f3e812735e9d4c9f208ca7f801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, indicative of a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=best+data+saver+for+android PDF link annotation
    • https://b2cexpressdemo.com/userfiles/file/govelimo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/78727764017.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/83925537734.pdfIn PDF document text
    • http://idcla.net/upload/files/94575100361.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/62389755816.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/somowob.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/nudeperovudilinupabuni.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/segokikujofaxidota.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/17942865182.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/4675225993.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361b235b79---dofit.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a901430ff---59876707188.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/dadow.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/69528191621.pdfIn PDF document text
    • http://fitviewer.com/files/file/nuxebefiwifadajal.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/93276911812.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d14495b8---gomoxes.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/28950197616.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/9082193935.pdfIn PDF document text
    • http://foodchemsino.com/d/files/98306088653.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139605995233---kevewexedapigima.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7072ad82c---tugulijerogux.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jezajisetuzorepevef.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 17080 bytes
SHA-256: 629abd94caca01434c5541808b437aeadc6d67cd43ef6137a17dcaeb66e15d19
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10420 bytes
SHA-256: 2260980972edd967e5cf6085a2a8b39d63289f84a81b9053b01d3aa186ca009b
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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