Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fa96cccdb395e7…

MALICIOUS

PDF

81.9 KB Created: 2021-08-25 13:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 611dd1b24929903824eec7639f436f1c SHA-1: 3eaad82a5e5c548f906241cf9b237439e11e710d SHA-256: e0fa96cccdb395e7296904eeb6b022d12b74a7a0c94b32498e01c73bb53f4f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm pointing to numerous domains, several of which are associated with compromised CMS uploads or appear to be disposable hosting. The primary purpose seems to be directing users to external, potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://busangh.com/attfile/fckimg/file///2021080805411_890272785.pdf In PDF document text
    • http://briquettemachinery.com/d/files/23829228310.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/botuxexepisunulexatob.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/54565812208.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b056da5d10c---lijazigutimaku.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/83620600821.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/refomata.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fgrmkcn6dvhch9jv7e16pbpen8/bosalubukabow.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/fugejegajiged.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161000e31665d8---lowusubomewuwuduvigilofe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/88689653118a883f8c4b6c3edb9c254e/tefofeva.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/386d19b7ebcb70e80b422248ffeed532/dajalize.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/mixabezotavaberufuk.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44359511925.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec9d967c5---metotipekejivufagatanizos.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/jilozuviluvuwutosufa.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/65771107909.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092edcebdb6e---86930576401.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/batitepowupakotopema.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/dimuzidaxawirerar.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/penigozututuxuraka.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/laxikewiwitobepazukim.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/88684280080.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jevipom.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/lavemoba.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e311dd40---72410120058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chesapeake+and+new+england+coloniesPDF 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10804 bytes
SHA-256: 51578349f67211d1f2ae3592cbbd40b84f936511ed92a01a2d6dd5125be8c2fa
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 17496 bytes
SHA-256: 9574411316b5d85df9cc1a229863fcb6b25543d168b97534166822e3d462f16d

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