Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8758bcc5ad3548…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 21:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9cd83ed01081cb8753735567177af91 SHA-1: 13581f75699c39da153cffc0922f83d0997068a5 SHA-256: 4e8758bcc5ad35480a6e1a3d4a3a4388e88c9b1da717d810f1b552f3b33eede4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate that the document is a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pc0cepit1di4skfddv5t7s089v/8216250638.pdf In PDF document text
    • http://goozzl.com/userfiles/files/45285283007.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337a6dddf19---gukilivegenoxabijadu.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/13033928051.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa9cbe4a9---57417865189.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/nuzubefajigebokajonam.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/bewekeru.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/73378745220.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/firiwowajugenos.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909110500.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/legogosukewewixoruv.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kagopi.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vujive.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/26185485677.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/61840183851.pdfIn PDF document text
    • http://dhf-china.com/d/files/vefosavogi.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/vakaf.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/10482272285.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m1hedkmnc1ejv16polab901m34/28329896590.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gapuvowisideseka.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zabenevuliralo.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/wowirudakiwuwugawaganamor.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/pebanorununiraboxofet.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/surebokudopomaxagesumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fisp+io+onlinePDF 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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 19744 bytes
SHA-256: b8b8f8399607a6403fffe3bfa73794ce6351fe04066ea69d9740fc1cd8ac83ca
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 9864 bytes
SHA-256: e1652a505474158cf250e0c1a155146dab78a88ee3b7aa264e15f33b47565a3d

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