Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ab2d07cda50234…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 07:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7080f361efff0925e9fff08fc0c288be SHA-1: 333f42e8cc02924aec2b344d935dbe4fc1aaa30d SHA-256: 25ab2d07cda50234ac21d29d2df015530d665cdda673b60bbd1f351ab4090206
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=not+downloading+app+from+play+store PDF link annotation
    • https://spvi.cn/filespath/files/20210916105631.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091611224073499.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/96003403226.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141043ad030c---63471893740.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/29821751201.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/34213838377.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/dijuzivolapize.pdfIn PDF document text
    • http://mrybalko.ru/files/58401685960.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/xuwuro.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/32337422280.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/babije.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vupuvafogixo.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/59815832694.pdfIn PDF document text
    • http://vladekoservis.ru/files/90935997739.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/12f074cc49949409d78a01795fbb3e6e/foxep.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vaxekopenuguvodorigesa.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xadosolidok.pdfIn PDF document text
    • http://redactron.com/userfiles/file/76641126309.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/rupifera.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/67700956788.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613db14a1685d---zaduridobin.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 17432 bytes
SHA-256: be92fdb667f45ee1ef7f7bae8264c3e590a776d72682d4ba610e6779b5a7eb2b
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11016 bytes
SHA-256: 73526852220eb75ff996b0e710c04c3c1b8c38f52d8952e75f5391d6f474866c
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1