Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c510b5d45cbf9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 23:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f51f0abab31eabbb8fe25a117c6c9ef7 SHA-1: 31f6ff65bbaeebc81dee2993186374822760f382 SHA-256: 542c510b5d45cbf9b96901ff0e7e94dc6584ebe0f49b9245f64953e69cf85b9f
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d5f130fb---nuzexakodote.pdf In PDF document text
    • http://deltastal.ru/userfiles/file/62603449183.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/74848593367.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dikekumadulufuwapuk.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/kofulusekamipa.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/72159200605.pdfPDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee11c3c19f---kagagotimesopotovov.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab087529bca---tiwikowitebika.pdfIn PDF document text
    • http://zl369.net/userfiles/file/rowisikux.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53730b9f---8992488770.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/be39f913a4529405cd5ce8db8858fcda/73143706576.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/91607420832.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/55585091749.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/39642936738.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/fomuratofupofirose.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/50839873175.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/97706543687.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/41914477730.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/segejoroz.pdfIn PDF document text
    • http://devveb.net/userfiles/file/sopofuzudunalezo.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/38376396705.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/90e0222f94eaf31de94307d7c659d2b3/72236467181.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tazepanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=verb+conjugation+esl+worksheetPDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 11028 bytes
SHA-256: fdd097b710a33d96532bd7eda274372cc5dd8e602c13e7a6ed841d0c2ed39dec
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 18864 bytes
SHA-256: 0c44751b5135599e29e9c96e84a7520d97c21bb9d5c16ddaa3f8240b06a5d5f4
font_02_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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