Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e401467cbf80a1…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 02:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8efbfe671f6a6a4eac0cf72508e55ff8 SHA-1: 658fb1343b70af2214a8ba11d548c26dc8fe679a SHA-256: c0e401467cbf80a1e7d91cbdbf1469c3d004df8c96015f50556252c701d39989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, such as http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba387625c33---66492861242.pdf, which likely host further malicious content or phishing pages. The presence of PDF-specific heuristics related to link farms and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdf In PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/76988139035.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/xetefekire.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/218c8f31640ab62b1eee0a01d09239e3/fojikudimamaw.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9ch5drep7hh31q5q25tr0cqcg1/63120363114.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/36365889042.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/zefolufamakaretul.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lewesa.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d5745db888057b355049e1dc7c1321a8/19583192833.pdfIn PDF document text
    • http://normel.org/files/upload/file/ribox.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j89up4ec07prja36tsbet171p6/xitopoxepimivojejevafopof.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca3cafeb8ef064108770364885276efe/3605404211.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86754998818.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddccda09d---mofiwob.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/91f50bd33879babcad779e1a9d928e01.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b9bc85d9650b834b44e904b939a0a43/36268416326.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/51604132842.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba387625c33---66492861242.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab66c62c3e---2748924830.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/fesarikelixokagafosu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160947448baeef---39002254702.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/of1q73vfh4dfck84n1unf34463/73165367462.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/gaxakiz.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-28/20210528011803684753.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/13337565740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tableau+de+conjugaison+allemand+pdfPDF 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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 22500 bytes
SHA-256: 33f0aeada8571ddd6dbae31602480996cce2bf22be53db4d87546b0b6f7dd17c
font_01_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B7 11096 bytes
SHA-256: d93a28ddf58b48ea829b67b0441e3971b8e00361f8c6ce92148ccdeb15d97634

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