Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71367ebdd3ed50…

MALICIOUS

PDF

56.7 KB Created: 2021-07-14 00:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53f4cf0297f059ed4d43d83f60921ec0 SHA-1: 6eaabd94719e3696e3fa5867d2ff23bf1c8fc972 SHA-256: de71367ebdd3ed50f416ea1bab8390f009cbca18359a2db9a78fac73af61a972
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8953

Heuristics 5

  • 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
  • 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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c6fa0c69e---vovidavileweduxidegupanib.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/zonavufenufufokok.pdfIn PDF document text
    • https://windsbs.biz/files/file/50672919349.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/97122233842.pdfIn PDF document text
    • http://sparkpro.lv/content/file/72290421919.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/19767158838.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/64607496810.pdfIn PDF document text
    • https://baptistfriends.org/media/16927184385.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d84bc81---90220509909.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73227676---livipuro.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186ab6e74e---77524349351.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/bajipidodijuvir.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a5ce31912b572b8a4595b76c8743d600/wejozokis.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/73220624991.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6acaa6f0bff652e74447488368e0c66/vejemewalojatevunogamanun.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/93160661342.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/sigavipasojivun.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b3b7458462b94dfe12e4f24cea59dba9/bavapiduba.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d0205308---beletadukowukusisoxug.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd587ead5---21649262318.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c717k94ns2b36t572r16j2ktl4/tevuxipupozulifobejeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=spot+the+ball+quiz+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 11096 bytes
SHA-256: 2dc00b3f74f8e16e428e64e7d0ae94fa223655fc0ffe0f52e27c0295c3a92a0e

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