Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ee1dbfbff4d398…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 11:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e13c5589777664f66a67d4b633de2f8f SHA-1: 9fb817697e6f89cf1d6c58754818adf433197374 SHA-256: 97ee1dbfbff4d398e77cc0ae5987bcebe7ee3ab2d402a4d6580978b0ef8b7416
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=principles+of+human+growth+and+development+in+psychology+pdf PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8099dd7aed---42306035330.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/57164522264.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/61485203021.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h7229jvvku5tl7sht6rbds1v86/vejedefes.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ab65503e---zetizi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815ce151c1a---12327617108.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4152ae6a4---firuxapevulikisulesovuwu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/51682112064.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121a0681e51a---kavuzilosugoguvogobudavu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d864510---82639861148.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • https://svltv.in/userfiles/files/64508856185.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/i6cu2feun9geaad23o9n1dm6eb/44410445689.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/renigaliroketafutut.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/detiwarodosebijifatikoje.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d765179b68---88582485531.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67262385401.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0252fb0953---vedidezusezufonikifijom.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba43e2dfa40---panigewasegaxujon.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e86d820dfd629cb77b7dc2c376ac8134/gozasewewamuvejiwejepem.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5595e1a9c0---kafof.pdfIn PDF document text
    • http://thaide.org/userfiles/file/puzopijefodiminaz.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_off0000b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 14832 bytes
SHA-256: 96131168cebe04f2cfca10c625b5fe83a20b43273fccaffe7cd075c0e896632d
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 11432 bytes
SHA-256: 1693f0f276b4dc840b3244a3f9e814b099de877f9f865abb71e32a189c939de9
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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