Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d05938f871e126…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 16:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 326525e147d8d730218e1ca4ce87dcb1 SHA-1: d58640d8210b20d2c8ca6b4247e432385b906d05 SHA-256: b4d05938f871e126ce3bb1f2e9d38e5ffd999dd01c6b187f389ac96178365c74
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern suggests an attempt to distribute malware or conduct phishing operations by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ideatity.com/ckfinder/userfiles/files/54371916648.pdf In PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vamaxida.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/57758817366.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/82534732072.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/kuvozelulemazisuborilip.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1f21230d---91668394424.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/768730cecaf220304b9cf64b858318a6/74192162214.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132835e34d65---18599036849.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/67736260179.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613babec772e8---sipuvore.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/11543931231.pdfIn PDF document text
    • http://koala-al.com/d/files/nunusawamunonopo.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/15858110044.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/dijujuzono.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5qfc0hmab5hjutimc7egh39dnj/gapewaz.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96975910156.pdfIn PDF document text
    • http://superbarter.sk/media/file/94226841155.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/19432381967.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/paragi.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/talokoxufujunaninav.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/88921067767.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_16F8ACF5E651E7EB.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/jezudel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mountain+base+ideas+minecraftPDF 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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10824 bytes
SHA-256: 1a55381ece66986274668617d62ce94e274857aa46aff75ca85befe6613a5fce
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 18176 bytes
SHA-256: 90905151782ad354d2ecc0d8f1e348ec9283cc664e66448a047e8d6a164a85f8
font_02_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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