Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdf5008e219fac0…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 08:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b95496bd2e45767473cf2f477c7f535a SHA-1: 2d59ee73285fd0a62d2c636d1aeb9b749f386a9f SHA-256: efdf5008e219fac01085c29b8ec4561db7888e71c417c74852706e233846d636
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress installations or hosted on disposable domains. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mvdeastudio.it/userfiles/files/89888320217.pdf In PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/savowu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d956beb7---fiwuxefiluposuz.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nude0251cviat1plntrcdjvlon/79420727322.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/834fc9613175f4eea1d70f26faa658f9/7839036832.pdfIn PDF document text
    • http://asfalon.com/__files/file/leduvamidemenejuxax.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8b08644e4bada6a08f82106bc5b5abf4/76675808261.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750cad67f5---26140914444.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a338f6613d---32832790685.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4d08a309cd82ad3ebaed52076c5d477e/donukekupimasali.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d04d4f0---vipoxunakuturiruduguso.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/161213a8140a07a4fddf1a2751f17965/46855582036.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c59vle5oe2p1fi54h4984ebgh7/46585162089.pdfIn PDF document text
    • https://signika.pl/Upload/file/nugajabuwu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3auhjibiv0neggp5r1ai43krh9/6099363812.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/sezoberapewepexinokode.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/timoxevazirinurigi.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5a4692a994b563b39e324b900d0d1e7b/11580484524.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/63112469138.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54107926501.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe656e96d---78421869327.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1ec4b9fa2cb80e3cac8aa64a8754cb6c/97528583406.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1a4695507295eb8e2d9520d35a18fe65/didaripulujatud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sometimes+lose+somebodyPDF 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_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10372 bytes
SHA-256: 30af0f706453465c179f080b7c95e06de99087698ed4da8ab93d04c30c0439af
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 17372 bytes
SHA-256: b7441b0da2412939165722de3fd74ae397b30905af1eaa1eb79ab14b8659d767
font_02_sfnt_off00013ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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