Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f162fd69fc0ba4…

MALICIOUS

PDF

81.1 KB Created: 2021-08-26 14:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9edb7f56a2d2c0149ae8f5363ad03b1d SHA-1: 013022fde6c6e9436b78771ef1750a5beb32410c SHA-256: 39f162fd69fc0ba4496265e98a9a31c8eab993299c71349a585717d6ac47ec63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content or facilitate further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://huntic.ru/uplcv?utm_term=slimmable+neural+networks PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a56eecb7adb---zunumufilitinefiwa.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/61294665381.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/tuxezepufufulasikif.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/57361691928.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/jotofi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c552fc24f6e890d24c404ad6697b6957/kefusujolawogonel.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe41b4d04f---mijinovuminegufoxan.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/43543135265.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/82055329603.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/xutas.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/24010585241.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706bcf916c7---37766783422.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/59d6544bc33de322722cc167fefa1315/guwuwosobi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c759211ab8e---newopazuwixagux.pdfIn PDF document text
    • https://rajakedua.com/contents//files/65725733287.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/71100972c93f84cf7b3b44505c69dd3d/soluwidofoganizi.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/81704931197.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/52190872681.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/31994710631.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160706e2f81ef7---80772033455.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad808ea8ba---38766653960.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c3424f246---soxesikunikoragisu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/21718441047.pdfIn PDF document text
    • http://beiks.info/public/file/zitamexazijirigabe.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/59878770972.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 1924 bytes
SHA-256: 05ab41b9585b90d37d2af1b3fddf95acdb16f066a4e390330deaea727919bbf1
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 10760 bytes
SHA-256: 68206a152cbd38ea4f0ec5b3efe4cc119dbcba84c41bab7f9fc7762baf22db33
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16464 bytes
SHA-256: fe8581d626fdc00a8e0a77c05f56a0a665ea8fec3533f34faab5e0db8f444dc8
font_03_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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