Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d7537152667fd1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 23:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0acc65ec5a1fa775ecdf0660e2bac912 SHA-1: 6da4b200f53bd9d32f66982707e7f0276b65bcb1 SHA-256: d9d7537152667fd123db5cfd5267adf9868ddf6b5cf2647466421744aadffbc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=online+film+let%C3%B6lt%C3%A9s+androidra PDF link annotation
    • http://wxmx.cn/upload/ckimg/files/202109050702319822.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zufevetalopoxopawawuxe.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zefale.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/45527069825.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16492704501.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/19442897468.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3546acbb465560b84e381817596eef28/wirekusojemomufixotag.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/60543737997.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/54329076968.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/fopafigasalusaniloje.pdfIn PDF document text
    • http://kbchina.de/upload/12510323114.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b6085089---rekejewobula.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/98170773042.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tujipofuze.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4c7ad397---70201128426.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/27968017102.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/84628131695.pdfIn PDF document text
    • https://verner.lt/images/files/7850313187.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57263231185.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109021205172450.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/72533225932.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/62674920072.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_FC5F044C25219495.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xesudidasonagujapomakuzib.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 19204 bytes
SHA-256: bbfdb114ab2223f93745f82b9bcb9592226bb03ade2009f46c585cceb0e0ec6a
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10908 bytes
SHA-256: 74d3cac1c3361c435a3cab92847e2935d0cc85ccf62e82fcd39fa55b5c507202
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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