Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf66b8c941f9b08…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 22:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c289c7db356be84e0c9c0ce32d4375d SHA-1: c97ebfc1c8fee80810d6345f4e59201ef319de91 SHA-256: fbf66b8c941f9b08018ea564549e6161e15269416dc23fe5f81e7b344e3c0665
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://mobydick-band.de/fckdata/file/40605512441.pdf In PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/ludofezapimuwilot.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/bemijupemapuwus.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/baviloremixalexotosag.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/1hsv4cgj3uodu5s9ribv0p08j8/16566181447.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/kevaxir.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/sikawunen.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35898a4e7---73171164011.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bc3a1f0d661bb3a35463ae41ab0cf35/93632142396.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lewuguvaxivugovuraminuv.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9578562f9c487504d89dd7a50ced422b/79222525262.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cae304f73---jovaroxutebunorurafe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee52dea3390---7430566164.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gemexusunew.pdfIn PDF document text
    • https://castel.ro/userfiles/file/66038433574.pdfIn PDF document text
    • http://learningkey.org/userfiles/lezawiwex.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3fe61ef82a8396789c2de1bade04e0d9/55465571335.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4291dc479058f438e85007a3cbc0decb/ligabaturavurofuxarunite.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hc4n61bqk2u0lgvi4pav1j3sjn/pavalakexofiki.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/55728223231.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dozebasove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+to+do+if+your+aerial+doesn%27t+workPDF 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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 17380 bytes
SHA-256: 1cf576a056ad9a7b7aaa2f76820d2a97a5b88541e54bf94263372b798a94b199
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 10872 bytes
SHA-256: fe5ffbe49bcb9a34022a02dcd5f075506956caad341c3969beea5be5f63bf0cc
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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