Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c885370ae3d63d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-26 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f530f8e3ba1b93dc4ce11ea4387931ee SHA-1: 9b4bdd65cd35acda8b22079e6cf3d6105a65e78f SHA-256: 52c885370ae3d63dcf285b804b0edf102bd3aee68f97e2b502fc0b8c186c3499
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure as a link farm on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedece19a7---zilugosutejalufi.pdf In PDF document text
    • http://kd-council.com/upfile/files/liwuwojukulisugolatames.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/74323146652.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/17291436846.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/mejumojubodefajogifajifu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba5daca95---sifex.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vaxugujenomiboreru.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104109513c7d---jukuxex.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1a12f37af401b7145fb44eedd7693b7f/moguzefekadademugexofesam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5a48582b---jitudufusupikixaluwisa.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/wuxilagifilike.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/gubawefu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67fd7c54e6e757f74cc97af6c9edd6d2/79358340047.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mepaxurudarogejidijifuzem.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wunavogezuwanozuvepenome.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mpas2q6gsqphuuei6ve0ei777o/jupopuzopuvatubozidubas.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/52667785325.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/56955783431.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a02eb1df2---pupebijebewaletovabanupen.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/568fe7bddfc1e38b9e2bbbac77417c72/85511927964.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/xefemusam.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/fipuwunefa.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/nasonanovofuwirusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pages+extract+from+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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 17640 bytes
SHA-256: 1d876543539eae08edfa3c077eabea0e96852f1aea41a73cb627d117dc4a9805
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 10824 bytes
SHA-256: e355040dfa4d828b9a4341f5a24db896a5de61bbebdcb4101524bf09ec31e44a

Open this report in the interactive analyzer, or submit your own file for analysis.