Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6aaaeb93ff2c78…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 21:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67d9878e9995d3b4b3541bcacd5d2f13 SHA-1: 285b8caff8206ac0120326357340bc420cf0f268 SHA-256: 0a6aaaeb93ff2c7863ffdad6306fefb1496cc26b61ab652b7d416cb7ac9573cb
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a 'Browser extension / update installation lure' heuristic, indicating it likely attempts to trick the user into installing malicious software. The document also contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of embedded URLs and the lure heuristic strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sesconbs.org.br/ckfinder/userfiles/files/bogusubexisunigeko.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9fbc3b128762930227eb67fe5eb517d4/lodagomuziburodakefu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6e08f0e7b5e0a036c44afdaf769ff189/7453738601.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/totezifebutazibo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71390119997.pdfIn PDF document text
    • https://autoskola-scp.com/files/6237973902.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18658261126.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/90874576988.pdfIn PDF document text
    • https://partetesal.ir/data/file/tepamudunalabepo.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/46692808797.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/18948232589.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/butisizutigarix.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/1124711564.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/63572806713.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091015070997.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/75382677267.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137045181d9f---lipetuzogeburedabafoziw.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f81fc305c---60386069383.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fhknrbq6recst5ufvau7vubp3k/22427060202.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5b1161b6ddc5a84a073c625a8218c728/tofemajozepedejuzabi.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/64611523095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+free+5+robuxPDF 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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 10372 bytes
SHA-256: 695153fae66767e280a269dd8bf3fef9d19075d5270f7c21031e3166c8c6bc82
font_02_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 17688 bytes
SHA-256: aecfcee08535d7b3bbdf0f3a19041d12b2eef197898f26ee51f044c3158a9d02

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