Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee80dbc46892e188…

MALICIOUS

PDF

91.5 KB Created: 2021-08-09 06:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bcfe52ccc749335077ff16cc73c51a4 SHA-1: f4a5dcb7cb84ec6287362891664cb2a28689374d SHA-256: ee80dbc46892e188c321a500e55170b8d027758f1afe35a1d1ad1a31dcae1ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the links point towards a social engineering tactic to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160729dea2603d---xafuvojafupabotosut.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/9197437717.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r8hgaoj4aicjbgcmr3vi7pijag/27769446476.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/027273338f226db866fc538ae18fb4d4/felezexomuxezikufanamuruf.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1afeea48---senevodesiluvezopulanitu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/1161163933.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/27082348985.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/45761255819.pdfIn PDF document text
    • http://anm-av.de/uploads/files/gitatoposulovamaluwib.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4271858c8d603d9b42c03b7280e5df33/41242036192.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/054a83105f588a496c4ef7f0da859ba7/80209968526.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210809_B56214328C1CE5EB.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/78657844442.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/53626486097.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/14265150b31502f4a1cb641db442ed4b/95507699066.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/bifewazowu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v8ocvt7vurc63a3f5f13t7svo5/175953296.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/96799253488.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/46518887956.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/21807392773.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/natqt942tj30mndoscqfba7fe1/10390108910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+download+license+key+pcPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/86111867550.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_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 10872 bytes
SHA-256: 870e632d6ffe72489d9c48ed3085bd9a4c5721de48d544560bccfd495204ba7d
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 18056 bytes
SHA-256: 5b6dd04659328cbc5efc66957a6d748a6ce8f5dfc304a95664692e828ba22165

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