Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd4a5ae4d803956…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57d8c429fc60ee6af861ecb7bd3c5c8c SHA-1: 3f959fafde8244af2c3c85a181eb72efae1bb585 SHA-256: fbd4a5ae4d80395614ae3d88222b7f283308c71a1992959140e7999e2b8b4a57
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm suggests an attempt to redirect users to malicious sites or download further payloads. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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://eventechsite.com/files/files/60469516126.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a5033c4ecca2ea6f3b00cb94165db0d/zusujugedonaki.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64146398949.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/pefezagige.pdfIn PDF document text
    • http://kechengchem.com/upload/files/36773422772.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/7407398988.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fobizer.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/61315658676.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/49591632276.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/gomenubidijuxavowuto.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/kirobugazefejub.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/6308589551.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/wuwidiviluriweduxamokit.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/82128930253.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/zujimi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbd4b767a---42918338286.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/jaridovetofufos.pdfIn PDF document text
    • http://atrsara.ir/resource/files/jixomab.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161476c1351ca7---83028669292.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/kazixixazudaxajava.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1152c26ea---kiralakuvumaguwo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/pewonurirazagasoxan.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/morajozizuvuzopug.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/wunivebosujitizufidirap.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/63730942539.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/8525954288.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kamidulujukepenorol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=notification+bubbles+developer+modePDF 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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 11064 bytes
SHA-256: 5844c2d7e264c49e9cf46944725973610e325a2640fa7f22195b53b4273f35c1
font_02_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 14584 bytes
SHA-256: be257dd4bf2e5873594f03d6b881ceb3a214ef9184b1bb9a9bc573e60435addf