Malicious PDF — malware analysis report

Static analysis result for SHA-256 125200683ef64eda…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 23:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b23dfa24764fbab020f153262cd639c SHA-1: a3869db26672ebd1b88b4de5aad812a2777d80bd SHA-256: 125200683ef64eda29e3b9a62f2f7db6481608f314147b5743915cd89fc53344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using a spearphishing attachment vector to deliver users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=a+level+chemistry+revision+questions+pdf PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df37214c---fumarabul.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98a195369---53781913436.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f7c158e8---fakekujemiramegujigef.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1b7697d366e6eb9b839bfa89744c505b/kimebobafozusiganag.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/69530467746.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/56f7a2710bfc266cd3632206c0634e5a/9564293764.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5eb1c1964d012d40ba3ec0d55e50df4f/sonezexefelutubivad.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/19561661098.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bd703a866577c95a60ccc8e697d9805f/buwelosutapasu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9b7c73f1dfdfa5dadf565479981ddfc8/litogamalokifovigifif.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f052e2d2df17b0298c91c97deeedd163/97209197498.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f866cc34---15680612524.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/mezegifolinulikixo.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xujix.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ebeb099c---remirokegevidanorojimel.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/46934524717.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f9644545785---zabaminebepupik.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1b208d21---rinuxokupazukisobusere.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/ledadexujogonedexukuda.pdfIn PDF document text
    • https://partnermind.cz/images/files/11542349247.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/supodebegejokasazusilu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/69764b78d9baf1a909eb276ac5423e01/20497932849.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/96197455992.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_off0000bd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5D 16168 bytes
SHA-256: 6fced9bc80ee474d040d72d3ac44aa7c3bbb44016f595327c516ba6ee8637e55
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 11128 bytes
SHA-256: cb577df2eaaf869d2461b014e7797a830507079a4f965469d7ac43583fce2996

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