Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fa1c1436fc7319…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 00:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2d848d4ae071a881ff5b4d37205010ef SHA-1: 399398584303250e7420b4b0c478af3111c9a0a3 SHA-256: 48fa1c1436fc73191170514645958f88a7beb19f9e556e18d8ca7ba2a5c8e054
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. Numerous embedded URLs point to potentially compromised WordPress sites and other disposable hosting, suggesting a link farm or distribution mechanism for malicious content. No scripts were extracted, but the overall pattern points to a social engineering lure to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d2946a93a6c6c118195b23a9d183a55b/42702053318.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/jegelanilowasovewaju.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/im6kpd3vpao8pl00j2u7c6dmu1/wabososid.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xesogawopugavepijogodegi.pdfIn PDF document text
    • https://fototipia.hu/files/files/74869120815.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zasodojoxumif.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848bc4f007f---54150378628.pdfIn PDF document text
    • https://digireg.it/upload/magoxenawuk.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868bf565353---muxubosepusup.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/10217832690.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/96991206888.pdfIn PDF document text
    • https://polandpools.com/contents//files/newisolonevoluku.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/51067755283.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/34326445501.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/70262533961.pdfIn PDF document text
    • http://www.toptehnik.si/images/70265790272.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/19054199876.pdfIn PDF document text
    • http://vejwun.cz/images/silakerika.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcadff4c68e---11253754080.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/90470239032.pdfIn PDF document text
    • https://renetravel.ro/images/files/35014755380.pdfIn PDF document text
    • http://phongkhamtamthan.net/uploadeditor/files/mifapajimorivumumop.pdfIn PDF document text
    • https://people11people.gr/uploads/File/78394402969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stored+procedure+in+sql+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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 16704 bytes
SHA-256: e3eccf648c859279c7cab7de7f7860c7d21f110a5a8d15c03d7cdb221a2ed73c
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10772 bytes
SHA-256: a1379500e5516f7cc5e54d1c920d0ba6ba2acc00a7e1368494a8b0bbc2743729

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