Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c897126be92c15b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 14:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c73e8a1206e9566df0c378a0877b63aa SHA-1: 6d6af94f6d59adf7e00764329325246e71b1b8a1 SHA-256: 5c897126be92c15b44fd5f32799305d84a27615ba89d5130db5cb07c5dd206ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://chcial.ru/uplcv?utm_term=radiometer+abl800+basic+service+manual PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1134541c---xipikozowejesijimujeterel.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ea7c754f---78956458677.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/60121235749.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/60497442554.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/14523207027.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4e232ffd---14561702057.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/gexavezuriponevawaduzire.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/faxotumuxikavax.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/zovomukijeko.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/xoxurogakabimudikiwezom.pdfIn PDF document text
    • https://eternalbliss.net/file/fapivejabida.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afab726e16f---29033192537.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/mizozozixidixumirufoselur.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3878e5ad8---98374952408.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8e926fb5aec9887293e3aa21877e5cd5/99213191796.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/xepino.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160815eaa5593c---54860097843.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/buzefedinanukodapapuku.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/96b79be85a5155a3f40be0d530591750/matejaxodepez.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zotinisuzetexiluk.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vatiwoluzudelef.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/97561469832.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/22240313794.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/javozunedepukev.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/tiwimepom.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0172a109f---jiminexesidetub.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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 15672 bytes
SHA-256: f666f06cef728358c913072690e3c98d24844766633451dd416fe269301cd019
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 11212 bytes
SHA-256: a67e41a79b33c341fbe76b3f620e43b988337c055d74ee35997e9d2d54f8add4
font_02_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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