Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ce2e964a5824d9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 181533cc6c1ba5f68bb8a7e270403851 SHA-1: 6e856902a2fc17be287767e1820c8032dca3f8a5 SHA-256: 99ce2e964a5824d98a96106e803898281178af899f28f2e585876bc73afd97b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://delphin-bau.com/ckfinder/upload/files/xedulafidafidilefexa.pdf In PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/niwezufidipotutafukugobo.pdfIn PDF document text
    • http://geodez.com/pliki/file/90558147560.pdfIn PDF document text
    • http://e-hematologica.com/users/file/60315092569.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cec9fff0a5b---59007311924.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/60784369633.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160791c00380fd---velokuvototebejabuxawava.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0jpp33eariv54vqco5rc0p7a3/xexeforilariraduduxokes.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/5705827177.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbe7f2288---12723503768.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gunalavedovipi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d1c52413---12716031096.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/redovepizad.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e71b93c5b7d---5487619784.pdfIn PDF document text
    • http://atya.eu/files/file/53745873456.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160703f6adca2c---55633081356.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a8f63976---52746891638.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/ridexigumibotozuzetanaf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79d669c10---7701653523.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/mudojavonibeluf.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/68588427679.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/vakadaripanaxavemaxuboxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=integrated+chinese+level+1+part+2+workbook+pdf+freePDF 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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 16092 bytes
SHA-256: f72c6b1ef96971f2baf8e3c82e1def330e0d3ea23f141389e4e6c9e29ba23456
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 11408 bytes
SHA-256: 6c2a342ceae35ec7ac59bff8f1cbb437cf37de1fbfd249c32dec2fb72793ea44

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