Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c90abe0f6b83ad0…

MALICIOUS

PDF

86.0 KB Created: 2021-10-17 15:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77b9ff58ff130e2e3fdbc43100c93b5a SHA-1: a0ec67b2105729ef9bbde79ae93e748d13f6a121 SHA-256: 9c90abe0f6b83ad040283aace7648f685f194c35f65c6b8ecfe0adf9d9320c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=accidental+death+and+personal+loss+insurance PDF link annotation
    • http://greenvisioninternational.gm/userfiles/file/gopudopulidikepifusanex.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/63104124801.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210923021830_1614688969.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/kogexunorinumebu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161625a7d4b14b---jufexufotowefowije.pdfIn PDF document text
    • http://candientushinko.com/images/file/90195650020.pdfIn PDF document text
    • https://hoalavender.net/upload/files/87249896800.pdfIn PDF document text
    • https://comfort8889.com/upload/files/xijifexe.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/14693144737.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/60835b5bbae58801c6e60527d8b51453/97148451226.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147baee572e0---zagoluvodepuw.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gibatiwitulazakedefawaw.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/netenunozezamajoziges.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/8744982203.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/detepalifavobogivimid.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/41272250301.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/sifonemuwamitaxaritaz.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/wanupakikox.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/vasimiligurixuvijedukokob.pdfIn PDF document text
    • https://campermagazine.tv/public/file/39490613642.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/28558336219.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/56536769338.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/4762758437.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/56998650483.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/luzobazisurifipofatul.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gater.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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 10692 bytes
SHA-256: f651b042ba0fd9003ac6d91f0cb97e86b6b30c66779c54c2963862ca3597bb8a
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 18024 bytes
SHA-256: 5a325ee5cadb2e06b64705e87857d21ddbb444869ebab927b9051f4685217af3

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