Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33bdfb3b40e241e…

MALICIOUS

PDF

96.6 KB Created: 2021-08-09 05:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5adc2d873e8cb84e7a9dee07a65d35e8 SHA-1: 08291d11f728e0dfb2ab6c85fca6a86279877a33 SHA-256: a33bdfb3b40e241eb5aaa22d06581b515538a3dae700f94eef4bc3358dd4a8e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and a link farm heuristic indicates a high likelihood of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://letresorellebio.it/userfiles/files/pekixebowote.pdf In PDF document text
    • http://sakem.org/userfiles/files/vuloketo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/leloxalodin.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qqvobq6k90a7h619hh7vj8r9kf/zusesumoditiju.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3f2f7ef2ac830ffdd39eebed8381988f/gogusi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0253b2066---zosulijepepelozisepos.pdfIn PDF document text
    • https://asiahijau.com/contents//files/91477495602.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90791566491b69ef2a0129050cbdbb10/97716270441.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67924957911.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824609b19c3---mufumizokatebox.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/daxekiribetuz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4f05c5faee2998fa08a9aabe8a277c28/likix.pdfIn PDF document text
    • https://alpinashop.bg/files/7767323694.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/04b7d1a6eb1b881461ddfee35ac3987c/puxovudinarogoruzilu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2a11ff16e192b6782d549808eaa8a50d/zufekabenukotoletuweju.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e9c3b4711a9b3cd808c7e728cbd752d1/75681359238.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/39067922913.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210701164756332555809.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/43348108321.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/72632081572.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabf2432e13---44483738936.pdfIn PDF document text
    • http://topstec.com/d/files/54203362759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=capitulo+4a+actividad+5+audio+answersPDF 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_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 18640 bytes
SHA-256: 77b803227a59c1b949fe7969f8fba1099df3fca6482a39e8422243f60c7c0820
font_02_sfnt_off00015a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2A 11004 bytes
SHA-256: b8d73bf49dae4e57a9b79cb204f0b5e0af16c04ad97ff45b306404fd2b682375

Open this report in the interactive analyzer, or submit your own file for analysis.