Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbfdc9457cc3702…

MALICIOUS

PDF

76.8 KB Created: 2021-10-04 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23ead8c26fa422769c9419f63ce431ee SHA-1: 62705de8adba0249bbb1f6707bdeeacab46c974b SHA-256: ccbfdc9457cc37028e507e48a3e7071d23c73cb3e1362263401203159e20f98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=doctor+who+s04 PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344f479db92---75691189230.pdfIn PDF document text
    • https://miet.hu/kepek/xukoba.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/27242739219.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fojisego.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/pavipabelumem.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d53c157cca18eab3b260376a7fa04770/tukanupelowitujap.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/sokofakatobal.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac64b9e54---88305992801.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/66614019401.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/tusejizufutetif.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109012137067823.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/89457061758.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/83627212313.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/21287922739.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/35008775576.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/26255586567.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/kusejifeguleditodobe.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/96853507468.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161594d48886b7---21017642263.pdfIn PDF document text
    • http://marvdashtonline.ir/userfiles2/file/papuwaxivuzawunosunezef.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/fedugalopedanirezudakogo.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/99527755690.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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 10080 bytes
SHA-256: 8a141e67b0af884883b1f9b04ba997e817384d30415e77f5c102ce520649b011
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 20640 bytes
SHA-256: 41844f1cc6c5e963210beb4d4d041094fb9938c5768bc2e1596ae34b5b8a9b55
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1