Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee9c6d842a92609…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 21:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1ddd93d19e2195c076447961728e3cf SHA-1: a1af7bb3b266dd8422f67138ce016bd2fc7472d3 SHA-256: 8ee9c6d842a92609fdd9099b2d7a89f91137573824d24240c0defff5a619866c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with spearphishing attachments used to distribute malware or phish for credentials.

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 http://dolekkoyum.com/admin/UserFiles/file/jefilalaviver.pdf In PDF document text
    • https://shih-tzu.ro/files/file/44052777367.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/sakagixodut.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae845c808---daleretexajasolazunutu.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/70871839157.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/28149110281.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109021201327514.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nususujulozetejeger.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/16555867524.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1900738003613483e5716b5.pdfIn PDF document text
    • https://campermagazine.tv/public/file/miguvatazi.pdfIn PDF document text
    • http://intertribo.sk/files/19908509681.pdfIn PDF document text
    • http://planetamama.ru/files/file/49046506009.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/008cf14e994bbbea5502c8ddf9a683d5/kikilekoluzu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/46327935117.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/sotodinabi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e8864f5c381ba86b8b5856ae18ad9383/tafiwif.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/41523073687.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/jakuvorevurazevelijon.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tudogufalakola.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/86873178006.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/badedivepozowagirud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=user+manual+for+mercedes+a+classPDF 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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10552 bytes
SHA-256: 96987d268fb3dce07a8f62bd387c1e32c6537294e7afbf487b77761f4e5f6874
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 18024 bytes
SHA-256: af4d567c94e552e42f30365fda232d5f4d8150465580a9e7ae984f8e28f5c314