Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca96fa8b3b12bf…

MALICIOUS

PDF

88.6 KB Created: 2021-08-03 10:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d6ccdacea93caf6d6d43602148a14dd SHA-1: f72e3b38585a9bf5b92fa3eabf03e34c6c0d52d2 SHA-256: 03ca96fa8b3b12bf15f6de638da4f40c7d98b52c9da44b7e4edc6d1098cfbea6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics confirms the document's purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qjkdu9vbc0cgv58aaimo4eh1s4/62077171751.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ca25b6edflgr0sske8kl9ok782/2680903032.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb3dbd57ba---26278947702.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a386c7b89e8---kusorulebaredug.pdfIn PDF document text
    • https://shidoremicrosys.com/media/bogepakojetadepepujom.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/simobinunavo.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/22055916587.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/62748222786.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wekiz.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/jawuwibusexes.pdfIn PDF document text
    • http://kisito.com/userfiles/file/36574085223.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/94430731537.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jogem.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455fe16ce2---nasukekilugeridanibonovaj.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/69939821958.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/refijowixamodogikidekoba.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/libimuvogu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cb4f449296b697b39b6772f5a5e4164a/bewoxelovebazapukidez.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bozedezizime.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gikirodife.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/ruxamunenopiverig.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b183005866---purigorireza.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zagoputotuxovogubile.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/722257057.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4648f4e---nowewanebogatuve.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef756f214---1463055280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1800+calorie+diabetic+meal+plan+samplePDF 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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 11100 bytes
SHA-256: ffed2c36de1660ab577bff743ff00ef010b56c1dfbad25885998d19101466eb5
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 17788 bytes
SHA-256: 68f130b6b9a859e0a318ba73e36dc667264850424bb8a2e71d7bfd326c794db6
font_02_sfnt_off00013bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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