Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef7f77b0b10851…

MALICIOUS

PDF

85.5 KB Created: 2021-08-03 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3159b461af7db8fcd29e62d669275b9 SHA-1: 98ae53c1ee159ef7a30b359ad6c529858711e389 SHA-256: b9ef7f77b0b108514cb59362df7176b99ac63f81ea73e20e0f8fc4b797f6d310
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document may instruct users to copy and paste commands into a shell, a common tactic for executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://synerhu.ru/uplcv?utm_term=kung+fu+panda+3+full+movie+hindi+download PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a291b194566---jorubobarivefitel.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/92801782341.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/99288714589.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c8d0221316c71a998345df61263e76a8/kogejeva.pdfIn PDF document text
    • http://absigorta.com/E/file/81835033323.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/39946782529.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/45224845184.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91717815359.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/682f4f3a903ad550baffee7fd875efba/66732500278.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/61963180391.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/sewawikegifukuramopi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d4b4d4e1---latuzotufakugewug.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/23947667434.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c781207f---84310285864.pdfIn PDF document text
    • https://industriameccanica.it/file/xozubofaviwofe.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210622185147_fv9uj3.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9l75maf1ha8qdm2vr1ft2egg7q/deguwunemawetoxod.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/19629173051.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aada2c52f5c---divokuvilewovevisinov.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14d05f9f6---rozezowegoduwafir.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73d9783a0f---zumapewigep.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda7ca8b9f8---37310559339.pdfIn PDF document text
    • https://network-italia.com/file/majetad.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/lulefurefali.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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10992 bytes
SHA-256: accb0f0506e5a20d40d9760ed9c7cab90eaf04a93e8fcc767725042bd446c40b
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 17012 bytes
SHA-256: 979d9827d93831119d2265f8961a54dd172cfd7310f174d93c3ac24347d418e2

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