Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cdb0bac2dd85c0…

MALICIOUS

PDF

72.3 KB Created: 2021-08-29 21:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a5deeb007067924786539fc7c2c7aac SHA-1: 15b5556e14d2e029d9f42265350642033d8430ad SHA-256: f8cdb0bac2dd85c050f9e0e721790bcb4bc9fbb486ccc66a97fcb7a290950132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54ddc28cd---kizijivelovasil.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1c669321---vugukosilajolu.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/86763273556.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/93183421729.pdfIn PDF document text
    • http://szwygs.com/upload/26566949336.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/23867756064.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611225b2389d7---jamorasedomajuniwof.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fozatulugorusugew.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/5212580756.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609afde97b5e8---20456023150.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/38cbeb1c86760dc6a34d3b2ae62478e9/72899096390.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5940bbec6c---51874044014.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799d568debd---11443439572.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bivasowibi.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/27893822412.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4dc7ed40072f1277fbbf189c7f02815a/wimulipisonasa.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/faledewebofoka.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ddtcivj37csqe3rtski7q8ant/xiwopobavop.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rakaburezofokixevaged.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/69442594498.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00dc30d6c---bafixexaxigerojom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=brief+moment+of+time+crosswordPDF 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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 15468 bytes
SHA-256: e3802f16bc779d476e0658bea2b71410e0614e5d5dd3fa641dfda8c6711fa22d
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10568 bytes
SHA-256: 6ecde2916d6e9f967270a5ebd6a5f27081af745fad68aabdcbd8b2f179ac9663
font_02_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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