Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d823b208f21be2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31d684560dfd6357632a6a052eb043c9 SHA-1: 5d2e25de5f9aced5bcca9a503525a1b4a7d5f903 SHA-256: 84d823b208f21be2ef398b8dcc0f2d571562699696610e1a90ca957ca4923b53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The 'SE_INVOICE_LURE' heuristic suggests the document's content is intended to trick users into downloading further malicious files. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://avvocato-callegaro.it/public/file/9459833892.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e3a421d75374892928e5e9e017d6429a/zowapowulipolugeki.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jukazagomafilabugupefezu.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/58368154162.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/96038930096.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/vigexazubugukexava.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/rasesusemisafefokusubad.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/sogukonilomobojexa.pdfIn PDF document text
    • http://snsi.jp/image/news_file/xirajutijez.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/loxifebegepedufamewidir.pdfIn PDF document text
    • https://cet.sk/res/file/diwukimekexiba.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/59422421366.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/barozovodugizivafude.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/sulafijuzivone.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/dadavibelivaferu.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/27299553372.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/48900347902.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff803d002---71009996429.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/67969840577.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bezegotenobo.pdfIn PDF document text
    • http://ch-yang.com/upload/files/97710922901.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2dc9be141---26764290975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=canada+study+visa+forumPDF 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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 18924 bytes
SHA-256: 36d46e0b17c50617b4e83d93f6988ab10452de5901187bf7cf706810ace786b0
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 10648 bytes
SHA-256: 4930db1dbe6926fc6f86ce7d905b95a99d51a4f074b1e62621f3293463a7e91c

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