Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b217e17f7d00d7d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 04:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10309619a20ca7128c5621e15d62e78e SHA-1: 0b3d84fe66bcddf310dd3ea6b6983780ef7ba0d5 SHA-256: 8b217e17f7d00d7dff22bc86dc5a617b87d5ef56baa3c8de250bf00f300da053
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links on potentially compromised infrastructure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4395a15e9---pasedutufar.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8fe05ce084b84dd5cd225a129ddbeaf3/40556330364.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfd580b8d---12833441309.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/303849e002b8da26354dc556a3f48104/81801329986.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kuroxilipipuxe.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/64878793299.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9bee29ae---dukojekov.pdfIn PDF document text
    • http://ridendo.cz/files/file/54171585386.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e062da1fc9f356c07c04bde697543592/tiroziju.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/54f7320d8154f305872e4e959efdbd18/tuzezizipamivebojuwuweze.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///jeminuba.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/72633378237.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a99effe5b05---tonimobujebebadefeg.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/45993598626.pdfIn PDF document text
    • http://rubensova16.cz/files/file/43162555094.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/94059699979.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nedamusekebibi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tebetagitoboxabamu.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/33915106694.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/2703132639.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098990035a7f---12673328041.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/junonofofoxanigowufuz.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/bofukixixewok.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/57bfe1c937423905d027613dff475f8a/99458708912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=refractive+surgery+meaningPDF 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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 10836 bytes
SHA-256: 59197c954e5f061c1d4a53d75377c54b05915a7352b634793e10c15f76093a04
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16512 bytes
SHA-256: ccdce8940a5d115b8eeae3946281f6eeadf77e006d8479404731ef957ad2a883
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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