Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95aaed3ab89a57d…

MALICIOUS

PDF

113.0 KB Created: 2021-07-26 08:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c743b49aa6dfca9b8349f7328c1b3a2a SHA-1: 9d3b25302553cc7e98171dccaf84d476fe107bd8 SHA-256: b95aaed3ab89a57db04109d6bf7776a5bf818e314b7d38f5e20e985ee798260e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing or a trojan. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f7268e8cefc2fa73739ec9080b2638ef/82382751198.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c8e9faa7ea08ddc3dc0779fffd6a6f12/18477212832.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/34896416128.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68dc36fd9---biwokofetuw.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5bde03cf---84028815293.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/p5rvb5knhj9hcst5rs11f42uor/dozago.pdfIn PDF document text
    • https://bem-sa.com/img/file/sokesabada.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95121689797.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/fijaxizuxenusud.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/movidetukipopezurirudekad.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/powisosuxobilo.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nimixinitezewirow.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1cb0cf34f27f0e2975437c2a0e8b7add/jewov.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/816347456.pdfIn PDF document text
    • http://toonesk.com/upload/dokufulapivexuxoji.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1d1c17ac---74306819739.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05bc48b26b---penoxubove.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607035a011dcd---26242243619.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/97347c77aea1b88a591f1000cf4744e4/63403936267.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/68258465043.pdfIn PDF document text
    • http://remobudostol.pl/pliki/14613735157.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/85539035736.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c320b4b925b---9318184670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nile+c+kinnick+high+school+alumniPDF 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_off00015585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9C 10648 bytes
SHA-256: 8a47dcaa8ece134f17bb926457b551ae2a5517b88d65f1cd36adbfc92656e0d0
font_02_sfnt_off000185c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C1 17900 bytes
SHA-256: fa9a19271574d00558c60e19901ef4c4979e806cba89c3c4f9783ef1acd883ca