Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09effb1b59c199b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31b4ec4932b8496cbe90336216e638a5 SHA-1: 7d90cba7cfe1ff0b10e75fc6ae3b9a69cc06601a SHA-256: d09effb1b59c199b627bac3c0e2240aef686f24ae1c376f74d728370ea05d029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.ondebiz.com/userfiles/file/89656299964.pdf In PDF document text
    • http://babamoleskine.com/files/file/nejanebifanedasanok.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/gimefuwurabesujed.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j01rdandtmq94o97p3ab220sk4/20793911730.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15a19190c---97465330765.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/91417352992.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/20669937345.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/rusobafovareku.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/76908044461.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0ec5d0c0---22777262517.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/22879230054.pdfIn PDF document text
    • http://dnepropress.net/files/file/xivepupepuranisevufovale.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/22562032125.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/88983401936.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/79676658913.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/gepojimesele.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031502079736.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a1c8028a90d702d5e3bcb8aeacd6a862/luwiwewala.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/84016933446.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/jefitadobelapazujav.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ujne4q5q917nc543qs3el55af8/10911012137.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7aadcf7c5---51202341130.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gexelukune.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/55156661215.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.pdfIn PDF document text
    • http://sieuthibds.net/images/files/95933671828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+live+wallpaper+sharinganPDF 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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 18120 bytes
SHA-256: 5f1573bb01a9364351086db5e1c6cef690f7dea3af0e2376523e382e20eca952
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10724 bytes
SHA-256: ad9e5ec95d4ba42589d4272ffffb1565e91dc5b527a73d0d96f42f8e09d17703
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1