Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda85d8469fbacb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e3ee0723e8a992a464fe473391bc511 SHA-1: aee05778979d77ed67a295a9f5213012f2126596 SHA-256: bbda85d8469fbacb4e8b2c554811a300bc59cb6db520606c7ecb0e6f0b5779e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=resistance+to+change+training+pdf PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d761e573---15391094810.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/22855138959.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/niteniriwixazesizabefimig.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n7c6eaijns7v3ua1i7sovblshj/danuwixofogevibogu.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/81107108271.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/53034260035.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/58974712724.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ahe0auemnmks3euhfp05lgsgg2/zevipelofimikomisovif.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118253c27a44---zafimojoxopeja.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/buvagurobave.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/buzonidowemobugudirubo.pdfIn PDF document text
    • http://wajl.net/img/file/202163051523.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c12i426tdrd3qfg0g5j9t8f1dj/kozoxilewe.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fdvqbhhpcqfkiiaas1u3si6qkq/loxojegavebafedum.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951d42866c6---10417293691.pdfIn PDF document text
    • http://blccy.com/userfiles/files/32250896316.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/98375619047.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/12874016990.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tom7gjcs278bhgvsesmtqddenm/wibikurerupatumipenan.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/wetojubowasogisilak.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/74nqh2an35eljn9174766ssl7o/xewixiwavaxavufimibal.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6226ef09b2---garugutadobiwuzibanip.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210623_224305.pdfIn PDF document text
    • 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_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 16760 bytes
SHA-256: 99b214c327364fe3409de71ba7a67165d06d8b0dee4d04f533e59fc7d650cc77
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10896 bytes
SHA-256: c8de4e7476cd3ccadb23ee98d60b5145dfd5e5eadeeb59eb3725a6565415c678

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