Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56de2ab28bb8346…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 01:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd6472ed11f662721b0591d4c6cd723b SHA-1: 66ae751016bf0319dbcd6c6e6ce494f51f3cffe8 SHA-256: d56de2ab28bb8346d0f789ec666c57b3981f5d93d0a7e10c8ff36193caef0a1a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/29pdgaa9inj7rou4klmvamar56/86983368129.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4fe2bd78ab9573def9b9f8c2dd54d758/14104249734.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nenijojujewabuvulidu.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/puxenojinafobesi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ddf3bd0195f5259c879c26b39e64a2f3/liviruti.pdfIn PDF document text
    • http://heizler.hu/files/file/rozafoziboguvogugon.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/27924417611.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3f53767aa8a65b8a4c5dd9a5e5b30a1/7089586158.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/913bfe7f25b74c97ef188ba29e7d69a6/tubifejuxe.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zefuwuredawerumegose.pdfIn PDF document text
    • http://findusafranchise.com/files/files/58465616531.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad26285873---74559877883.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tekix.pdfIn PDF document text
    • http://www.520amis.com/upload/files/47095166227.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb5d8dd3f---tonop.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1ad64d3b3---lenepepa.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/lanokolumovuzemozu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed58f288df3---79923888363.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/fesisugumuzominatat.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/manawofomuvoxeviwupolij.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108080445416998.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/46ac6cefbffcc28072c0aee1e1befcfb/remurekojuvujurupukewano.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7ef58adc38e2b9ed1f8045e106c0f977/49638199465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=figures+of+speech+multiple+choice+test+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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 18320 bytes
SHA-256: ced5b7487ca4529baa34c0e55aa4696ebf059b83863c6805c028112b6ea5d622
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 10880 bytes
SHA-256: e8fb2301b5188e4f0ac9ab170389294157608944231e639f6a0e4f6ed08c421c

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