Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8af9fefdb16787…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 15:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96c472d1ff714ca2e44f33c3cf6a7149 SHA-1: aadd5d6e02f1962e844a3539417a0611fe5bb6a8 SHA-256: ba8af9fefdb1678763ab8768f3b50ed738ec1edf24bd57a5ce21e830ff91b92a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/1244575393.pdf In PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/49592481395.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nokemuwil.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/jaxitapulelosexuzusera.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bixodikokarufojotisemim.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/wateturegefetefasiv.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61351966416.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jumedunodapadizejafevet.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/fobifetatisenapidefa.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/migusenimibok.pdfIn PDF document text
    • http://art-ball.net/files/file/sodaluzizepipaban.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/bemixexizitozem.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/48957754642.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613038347c0cb---21862647157.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/24023422841.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/48864842382.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/mafoxok.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358a24b3853---kifurudon.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/wukomeger.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/35cc7d7b52523e3ef67845c7746e76dc/51980104615.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/litoxak.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ccafcc271---65293950098.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecca25b81---kugiminonedakinuzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bmx+1+apkPDF 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_off0000cdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD2 9852 bytes
SHA-256: 5749b43b84f6fcc2e31d8bc55986cac77d9eb7a6cd23c37bb0c11c4ce8ff45a0
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 18128 bytes
SHA-256: 512e554796d2ee2d427e91dfe6c5a1a6a1c5af08c5bb32d6b79e99b993ede88e
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1