Malicious PDF — malware analysis report

Static analysis result for SHA-256 65efd1d23c1edd70…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 13:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef5c1ea9381ab631df109df90774bea SHA-1: eaff6d591f9c8e1baa73ab287d0ec88d23f96335 SHA-256: 65efd1d23c1edd706df10a41c69b15d64172779bab56c56b058e70354a958ac9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains multiple heuristics indicating it's a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pajurioverslas.lt/ckfinder/userfiles/files/xijizoxowenebavo.pdf In PDF document text
    • https://akgoz.zemta.com/uploads/files/xiwepulo.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/86720329253.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/36155699335.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/69828116150.pdfIn PDF document text
    • https://zhansq.cn/upload/file/vipejarazulaju.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614272da1e6ee---50061602555.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/67630749901.pdfIn PDF document text
    • https://naves.cz/res/file/66790940519.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_12489_423.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/655444a5d65a022a8f8d75bb13cbcc44/liwajijesovejuzajefufesop.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58e62c35958514310a83cbd1760a2753/kevitopukofojuxen.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630734642.pdfIn PDF document text
    • http://ergakiland.ru/files/files/73566022240.pdfIn PDF document text
    • http://ergakiland.ru/files/files/48505145872.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/vuvusaxevexuxibata.pdfIn PDF document text
    • https://lazerom.pro/media/file/bupuxexesigurokip.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/35148324361.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t86r5cvaci2onocfvcvn9pve3d/34050999720.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910101853123.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/8842883509.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f56ff25983ad93b3cb9b9f183fafe365/xedebunupa.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/28909448495.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/47258258112.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42e882efdca4a081e4d0ad04036af758/9974907355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+earn+free+robux+2021PDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 18564 bytes
SHA-256: 8ee9777fde2b7d820665c6339300dc14c3e0392698c4f88c75727085fe1a3b4d
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10612 bytes
SHA-256: 39a836991dbe36b3d79aad7236cd5e86c41bd1e7cd49e55a16ebbbdd559830e2
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1