Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb244e768839b41c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b260c31f98fbe5e25a0b2ea0af32193 SHA-1: 73917f36588de8f1ec1d82f72044103320389d03 SHA-256: fb244e768839b41ca685786fc8bf57ca507b21336e500f1f130f4b4107c18998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common technique for distributing malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kopari.hu/files/file/vokoko.pdf In PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/gufiseretoneden.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/92273610449.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o5nbbbgl27bndb9q8evlpmlk6l/wasigusunaleka.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/rukugojupi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/duzadadoz.pdfIn PDF document text
    • https://eclearusa.com/images/file/doxopilax.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/pujumixotog.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/28944044139.pdfIn PDF document text
    • http://chinazzjx.com/d/files/piwisewabore.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/sodokaxujud.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/83ff8bf2ee1925d710706a160608f421/72974815000.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf267ce2c23---92821618015.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/bepodakolawoze.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0abf525ce6---depisejafod.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f88df279---fepajalabakakojelop.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d2aab628a7e553098093ab3d9b79093b/jivewapexavigomipu.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/52169772616.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/ziwimoxaguxafer.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/zowodexawebasumivan.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/vewaladisubudidemekosade.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3c8441459f4f6cf61043d49fc9f74e8/vilofiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+download+philosophy+books+pdfPDF 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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 18184 bytes
SHA-256: 0c77410378d626e96d54754b463310aea80ea067d54c93c1f496e808d13b47c2
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10904 bytes
SHA-256: 4fa230677e189814888fab9ab0a59afa26b090267871277934dc7e14dceeeb9e
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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