Malicious PDF — malware analysis report

Static analysis result for SHA-256 e587bb796fd75c64…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 02:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c0adfa71d1547a27f04a1ef738ff0ce SHA-1: 4d9a7aad07fa3119c2b77371304cca7fee8a1bdd SHA-256: e587bb796fd75c646fc96b60085f0fbc2b4eea5e7b7328eaacd49ec1255beefc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to external PDF files is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e91493a91---vusivabura.pdf In PDF document text
    • http://visusmarble.com/images_upload/files/mimapotazamesuniv.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nufabafemidoxazozedegofol.pdfIn PDF document text
    • http://nemalipics.com/tepaxitidotemosu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/8101675361.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/43995744586.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109052332105727.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb8ae2a05---89371333048.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/50010326526.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lebefejuzeximos.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911172055.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/mewobisizejip.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd74be23d---81573810141.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59831e3cf---rovegorunuwumimuxi.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/gepijulerebudisewibag.pdfIn PDF document text
    • http://thevalleytrader.com/files/nigomokov.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/90221186639.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mabami.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/zeneravidunejolepiju.pdfIn PDF document text
    • https://hoongnau.com/upload/files/likomigisidokodiposi.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/jokoguxewijoli.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/10738629245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+libro+open+mind+level+1+pdf+gratisPDF 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_off0000ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 11220 bytes
SHA-256: e894779701bc4fb910781d360ccce7f5f2fbbddb8e237b7c35a7ad508597d8b3
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 19408 bytes
SHA-256: 53d8d88a9405660e06e7e1a61c4680996bf79ab6f61fe5419848e3c4c8e303ed