Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e88628a97b987f…

MALICIOUS

PDF

99.4 KB Created: 2021-07-14 09:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ecfd0a75fe2271b87fe0399d6246cd2 SHA-1: f303b62c7c707a6a6bc9674ce911748546d7087e SHA-256: 01e88628a97b987f2b08f8d563b873ffe2acccb4f2e943041e977710132d721f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608573a78f8f7---33942872557.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h3ln3k7jm006b5e0b9ohs8gigl/rodafoxase.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/54666583066.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5541e60d---numovegadulakavowufufem.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce59e646dff---95727129383.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18af7e113---kadumimiguruvagonokutu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160867417cf172---90739006776.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/96781030070.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ea79df1b---norugabulelon.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a898d03a2---vifotetitulumezizolil.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/62720441782.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cfc61698c99649d384cd239bb8ef3223/wuvesowijimoz.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/9d03e58dc0acb27c976375ded2c5875a/66347717757.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/32739847898.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/wozoto.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/33776472524.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/pibebufajiv.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794af2b8ab3---76598677550.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/569032212.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/13398049236.pdfIn PDF document text
    • http://chromoink.com/updates/file/vexabilovokuz.pdfIn PDF document text
    • http://mp-journal.com/media/file/zosoki.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075d04613a1e---molusep.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xigaxewevurojegixebovex.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c895ae5b397---zigiloxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chapter+7+class+11+physicsPDF 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_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 19728 bytes
SHA-256: accdded4bf058db60526eb8ac4e9c4d7b598aae7f0a1d10f5b7a9afda65f2802
font_02_sfnt_off00016816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16816 10496 bytes
SHA-256: 1cf3071eb74935f243c3b3b4cc3419c128c7a31d06fa84affb88f966f3f201b6