Malicious PDF — malware analysis report

Static analysis result for SHA-256 c257e007e19dcd28…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 21:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b97fefbdafebe913eeae0851abd2291 SHA-1: 08924c6c18f67002a09da1b21ecd96c729846f0b SHA-256: c257e007e19dcd28da78d6512179cda415e5c77c71ee8e575c60494b89609ed5
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. The file's structure and URL distribution suggest it's designed to lure users to potentially malicious content, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161401b69d6a65---74199831686.pdf In PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/vitib.pdfIn PDF document text
    • https://bloc-immo.com/images/wegumodav.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tenukibuzokidebu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/99741892281.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f9dd26f5---rewedexoremosok.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/digidutalerip.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/96211237450.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/76092790207.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/19400059073.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/12838595884.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351402607ff---xibonodam.pdfIn PDF document text
    • https://signika.pl/Upload/file/xedugejivawikogir.pdfIn PDF document text
    • http://reichspfarrer.sk/file/21373980973.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/wejamupap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56e210929---subosopojajog.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/gogunelodumivizoduxazeva.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4820a2a6e---8511000938.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/32311130652.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/7438202380.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/40446493702.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rexizedewulekubojus.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/juromobubaborodu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16142da2ab212f---50035638230.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/jetifijasidigide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+file+for+ppssppPDF 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_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10284 bytes
SHA-256: a7b78961b34b876f887310f881692d2c5a58df6e11e19118bf8bb35e505a50f6
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18188 bytes
SHA-256: 06894e24b531d6a21df5dadc79e89ea8029856120653f3f78cf48725bbc63d89
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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