Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c63003221cf5276…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 244201818f380115ea2af3a63c3df6e6 SHA-1: ff4f79e6161957209c6df2774e7d8132df63295d SHA-256: 8c63003221cf5276d8da5953cd47b060fa3f9adebae298981622d562c633e7c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to external sites. Heuristics indicate this is a phishing or trojan distribution attempt, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=frp+bypass+apk+2020 PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/82988239242.pdfIn PDF document text
    • http://horvathortho.hu/tmp/45363228699.pdfIn PDF document text
    • http://webbuilders.com/files/file/69452293982.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/piwimurenumomiwesev.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/nojiru.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/50342459013.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c898e4f5ff---16002536680.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614789cb38809---78161664237.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/81950426873.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910192432.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/watubozafibujipuwesozifag.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/58938887438.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/16057446358.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/59093551968.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kofobemerakenumozobifa.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/93740416182.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c87cd5239jothhmf2dqrv9gdud/vemili.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/34071631293.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kewud.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tuwap.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/dituworazebiwamijobip.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/bugufugafakudoneta.pdfIn PDF document text
    • https://rajaunited.com/contents/files/zabedixunipopatefadisi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146635f2f336---rowozevufabiwik.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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 10220 bytes
SHA-256: 72d8e5092098f0b47d561c9ef38403ec5c22d7ad58a08cbccb7be44274901cda
font_02_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 19204 bytes
SHA-256: 9e34fffa9bcd84007e2c4d87b893a460a85842eb09be8526c1ba7e6630020291

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