Malicious PDF — malware analysis report

Static analysis result for SHA-256 024ccdf1b88a6ce7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 12:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 356f014d669259a349806fcdee50f0a5 SHA-1: cbe04a55bf6be03e3ead684c2090c60f8807c907 SHA-256: 024ccdf1b88a6ce70e6532f857fcbb75bfc82cb1d1a0a90363936d7831a22cca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=android+telegram+source+code PDF link annotation
    • http://mirai-kankyo.com/userfiles/files/fuvapagopivalodikagudu.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/japibuvenorumupujesere.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/butogowadinawup.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/zutiguvagolafanoxab.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/28288829617.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f6aa81bbb6d4f190f35c1b8521d8fd11/38370508410.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/77772040827.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wubewetu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/737527e48b07f0663451ffe2ddcf0a9e/liwabirurerenodotez.pdfIn PDF document text
    • https://stotex.rs/files/87584657260.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/rejunigipisojugafib.pdfIn PDF document text
    • https://inarsindbari.org/uploads/66171443068.pdfIn PDF document text
    • http://fitviewer.info/files/file/1001330383.pdfIn PDF document text
    • http://platcometals.com/images/file/20690781856.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/42727144334.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136c2961b54a---45623221480.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/99608276024.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/fubok.pdfIn PDF document text
    • https://gameclub.by/uploads/files/67933065686.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0f4a20ef---teramugawajo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/93827361927.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kaxajotokijakijudeva.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c04595014c8d62eef542c8ac3fd26008/17246710671.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_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 10792 bytes
SHA-256: 271f089669adf102aed00419ef593d94696d66b881fed3ef53334f335a188d5a
font_02_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 15968 bytes
SHA-256: c877e694cacdd3924d34b3c9416c6b954223c804ed221494b57693dad9ee8883