Malicious PDF — malware analysis report

Static analysis result for SHA-256 389ee2bed3a3a455…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 07:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba30bca286ad1186ca39cf93bbbeebb0 SHA-1: 4c4e71bccd25c703e734412fe9be35d2b8db6de4 SHA-256: 389ee2bed3a3a455ebde024458fca254a44569f694997668b358d7ef619e6943
156 Risk Score

Malware Insights

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

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, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://krisoc.ru/uplcv?utm_term=rounding+off+worksheets+for+class+5 PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa1d2c1d7---67173368355.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210703_58CD3C525F66087A.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105181202426900.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuzirewedi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/26553179837.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc1ec52b35---tumosesu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210810020842.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/89451624650.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167b1465547---wunedewepizasuxulijopev.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607280811b35a---soligaw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/085ba0cf91a4581209985b0abf53156f/45100467507.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/milanuroxosapidulavareje.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-25/20210525042734430020.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/17795464309.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147c467992---moxemisejol.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f1e74c4---ketadafojagagewubipib.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mozezutiso.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210519185815.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4053459952.pdfIn PDF document text
    • http://rilta.net/userfiles/files/71965412166.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/jiwusow.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/muruzi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e31a2cbf---13853833983.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4300badc1---jubegax.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/51549389301.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/52003919324.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16105adc57b9ff---62913183668.pdfIn PDF document text
    • 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_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 11212 bytes
SHA-256: 8e023bf69b93f5ae6a50bd2af7cd6e2ca4b32f28c64bbb3cd30d5ae60f3e7c4b
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16380 bytes
SHA-256: 9e7444785e46efed79d4c3572f1162664a7c7dd59010df2817f6844ea051a7ad

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