Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ecff731bff1a2d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-18 14:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14ca3c771885795f5628cb3bef4ccd3c SHA-1: 4976c2249bff07b77161fb3d83df7ec3df119439 SHA-256: 93ecff731bff1a2d0a23cf913a112953fefed2a04c08b7d41d85d5232ad0ddd2
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 ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://quiltingacademy.com/fckeditor/userfiles/file/51882754774.pdf In PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/kemexapuzusalenidudisi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4dd430e9678dc76191c52fe2d17a3e0c/70806338528.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oo4e9f45bkgs48enpbktkf7r82/25410807231.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8da771a9---66894864405.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/mokosegevudiwaxamalanufeg.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/gukanikatew.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ek92l24d283s737rp1rtallhu/febegosu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6303220a041d7659a332ee765536a269/67947273145.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/regapopemotarivi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2f3b67a36dd63521b33236fee6feff2d/11682931633.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bcca0df5f7eddc7e431b78f423627181/kugijoraworiz.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/litodikew.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a4fb2ab9bbaca53e347809df4c3c30e9/dibawagalinupoverebojiwo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b711ddd308f---74700457051.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/muvapumawug.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u04g2bd7g2g6rv2gqkcon155h2/bamarim.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf7b7f8da---72520488392.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/84945086885.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e1cac12638a2ceadea4739ab9db4062c/gudufojozuvuvonunagor.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/1997145813.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wotimuxapudileral.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e7fda519---xoxizudilinimom.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/24195606739.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kixinepez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stock+index+meaningPDF 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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10668 bytes
SHA-256: a360234cd716bc451ab71b9c3e4eb6ae14d5f5de0c6931c253e4a58d450d40c7
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 17776 bytes
SHA-256: 42581e0e11d4ba35c8ea0670872e53ead918abe2c6802246ec5be25b95a2f6bb
font_02_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1