Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d85c1e83dc5813f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 16:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de8022a09c482f5301ee9dea8f78f7af SHA-1: cc4819ca7fd81a08b59c3495c820f630a71a0c1e SHA-256: 0d85c1e83dc5813fb3466abd11ca471f417df54b6d673aa20b1ee15370c3ce20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these resources for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=what+is+the+subject+matter+of+starry+night PDF link annotation
    • http://progettogeometra.it/userfiles/files/84206833694.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/nekopunenumeji.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/14469160969.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jobuxeke.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457fe9937c5---wokaditala.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6871ea7d9---78582491319.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/91557981415.pdfIn PDF document text
    • http://popeyebio.com/upload/files/50612030875.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/91654765616.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/397ffa8413db71008d1e5057a8dfdc13/46060061823.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vopezijezetifikutag.pdfIn PDF document text
    • http://vizcsap.hu/files/file/mijixafexelavebesopivij.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e3f20d06e---15587181000.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75293994341.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/xakazaxogifitidedulo.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/juxedamusizetozalizagi.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/60194682700.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/38442312282.pdfIn PDF document text
    • https://anfauglir.com/images/file/71615063227.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/63645963548.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/xoguzejet.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/35707659037.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/razuvugivopejejuguni.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/65038152422.pdfIn PDF document text
    • http://iltorg.ru/upload/file/sojosukidef.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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 16696 bytes
SHA-256: 5fd10dd780e94dbb782a9e6bd57c54ec14d355f186c46b0cf8d73d7ea503e370
font_01_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 11216 bytes
SHA-256: 66f315f66f660cd8c10c9131c4a7b58fb5c47ea8d61cd3a10330d9cba6a424c3

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