Malicious PDF — malware analysis report

Static analysis result for SHA-256 6952e4554eeed60e…

MALICIOUS

PDF

153.8 KB Created: 2021-05-30 11:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ccc1513bea2f9ed0c3bfb2ac725c135b SHA-1: ca2e3a8f9c683eda8701b768d2b9ef0608c13b64 SHA-256: 6952e4554eeed60ed5fb59989486b234b66442a94eecd5cd7c2fcb3f335db874
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/eu97kj84j8s8d461eoqc5eln3c/dolikutuvimibosa.pdf In PDF document text
    • http://alkanboya.com/files/file/%5C/lufoxupowufukilogidiz.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d5a933d49cb31cb5ac4c8b26da35b524/vevuzek.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/73981635975.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1tobe0iicug1oslvjhh855ovm0/90793959650.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a6212d563340feb0764e11c83c5495f0/lotupapadenajejifikevedar.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/37617104275.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0aa3df29---sikofedawilezelexodin.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ade32438f24---95187034176.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7acbf5301b1e1abca3562d0cacc586cf/piwijawolu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/52338190076.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859a96377e---tizinadiw.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/81512599833.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/45063285699.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/df41acf784be98b9d63d6ab6d68c3555/83818871307.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3bbe0e4c54f0431f8f1f9f13cb8a2150/33155120162.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4a4882005df305f1b69eaf6b7bec00a5/16654094336.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
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rey+burger+rosarioPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21382 4764 bytes
SHA-256: 76892376ebdf587f0d406054ae850d9d7f5c2a629db56a7a96602490d426e6ac
font_01_sfnt_off000223cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223CC 11800 bytes
SHA-256: ed659497ae3feb330fce94b372f8bfe5e1a09d9d99672e4620878181a2bd9ec5
font_02_sfnt_off00024b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B31 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230