Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ec69fd25427ea4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 08:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35c5617dccf38510c1f7c1b6e149c162 SHA-1: cb4b8e8e523d91f62237853dd2a56ef9523d610c SHA-256: d6ec69fd25427ea44d6ba4529e03a44c1d599bc081e2ac12caac726cd0eb1741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=the+best+dark+mode+extension+for+chrome PDF link annotation
    • http://inbond-cn.com/userfiles/file/gexapavulufev.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614141e6d85f8---gimeluzawagijunexovujepi.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/61563915648.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fejaxisujawibudule.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161316e424726c---wugedasajefodigusuwulege.pdfIn PDF document text
    • http://grandfiltr.com/files/file/resarosizi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93745a72654c644e3c1cf2964074ec67/7352027807.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/jiwikajuxomakizolijuzuma.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/24869372216.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/tadofovatelowajigilab.pdfIn PDF document text
    • http://bienbao.net/uploads/files/45843536767.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/24553965024.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/246d2b53364628a804d99c0de0abf675/31552683506.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8a27e35q9tc6i7gf555vnqrcv1/87547018570.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/25705729353.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lijixawirut.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/takezetemuxanurisitu.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/purefovuxegaxakejuvomik.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/vivevife.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ivtv4aee0irr0b9gk89j5tk19u/27792702830.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/tanixo.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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 15588 bytes
SHA-256: da034aff2e87aabd6d65aa4fe564cb25e6be6ae993ae9d16ab76e79ae4f08e4a
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10992 bytes
SHA-256: e2b8a0c915226786d48bcc95bd0e2d08060854e66aff1763bbaf267087fc541b

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