Malicious PDF — malware analysis report

Static analysis result for SHA-256 333b9f2839fdbfbc…

MALICIOUS

PDF

91.1 KB Created: 2021-09-22 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eea8d7047dc3418a690b3638a95c44c6 SHA-1: 93f26b60a6ba07f0fec74c87dabab2bbef04e9b1 SHA-256: 333b9f2839fdbfbce564e1e9f4588fd3e08aff8935c78a1db40c584667d03c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://medvor.ru/uplcv?utm_term=download+games+for+java+phones PDF link annotation
    • http://sarica.com.tr/ckfinder/userfiles/files/87997828147.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109140845292468.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8847858f---60379369155.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/runuzuwizejule.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nomulemukemufu.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/woberajikuwukusotobu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142005c1b690---lutew.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/29431233869.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614425cf69821---57708604885.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/94791302975.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/41726081819.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/gebifuteb.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/43378049365.pdfIn PDF document text
    • http://digifast.cz/userfiles/11057699497.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/40943527057.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/45130716619.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xizufitofepiliwisudo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/rufeperur.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/25595642795.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/19963080852.pdfIn PDF document text
    • 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_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 11036 bytes
SHA-256: ce9c5152c57a9ac8ceb0cec00203e1153ab0d331449796aaf1e7b2536e78c829
font_01_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 19648 bytes
SHA-256: b3c32c01b249659affaeda0304c69efba329f6dd1a93b0a37d07ed4c5184fde9
font_02_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1