Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0d111a7d6a3fa2…

MALICIOUS

PDF

108.6 KB Created: 2021-06-12 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2debdb8e2e12aa2eec1ee78bc81e700e SHA-1: 3481b275bb0045f9704a43020d68fbc6f1d6bd93 SHA-256: 0e0d111a7d6a3fa2d6342bb98cc8c244b7b6741aefb70498405ec4495efd2757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=indian+economy+textbook+pdf PDF link annotation
    • https://serwisnawigacji.pl/userfiles/file/67113072383.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/11545420121.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/70927232254.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1f921ab2---39584155878.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/4812215513.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3d8cecbd---91014480558.pdfIn PDF document text
    • https://mfdesign.hu/files/file/41331168613.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609038c1e637e---fokawafafamikusaxesos.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/10573978705.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/soviwepunuxiwi.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60362310042.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb3e7bda0---40718456692.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acdcee46dca---75940119266.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/72714317615.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0cf73ba8214c0f9751a9da06c1fbd689/2519437773.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608937c0dae2e---98729249575.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/golosineboma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16260 5096 bytes
SHA-256: 76ab4b31416eb67053bfc1708f204f66f9f0dc3ba9764aa4169afe0eccc49502
font_01_sfnt_off000173a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A7 10500 bytes
SHA-256: 0db01a52473fa3e70a8d32e4f3b1ca7c2f1cb26f791a2f116f479974552b5a78
font_02_sfnt_off0001973c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1973C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2