Malicious PDF — malware analysis report

Static analysis result for SHA-256 25be92243a3117e7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 14:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 718d8a4fabba6230046e25970e5e58ac SHA-1: 5c50ee4e4b73842d3a59c677443775f8628a1f5d SHA-256: 25be92243a3117e7dca7924d03410737d3bf30e60d48dbcdf014d276089aa37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=serway+fizik+2+t%C3%BCrk%C3%A7e+pdf PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef3c78e99---79252360837.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/naxurukoba.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lazogukodonidinaxotiwaja.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/84435954982.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2f2ef0fd571add66c05df7a82b857b2b/fulavufepazadu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/35180290373.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jejozobezeposabufose.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kisog.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/difuferiwezesotufobow.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/jerojokabakexemuwikoronod.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5a3e0911b2bebdc8042423cccda3dc86/63022889662.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/28758592839.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/vadevafopuralafuku.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/babipetu.pdfIn PDF document text
    • http://furniture83.com/upload/files/mozolupagesubesejinazazes.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902091009.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/gaxabezutomar.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_off0000bfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD7 18416 bytes
SHA-256: 7fd1bebf78af7f86a5af62ff4c840d5a7f60f05b699c057fee0f2341f81a6334
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10992 bytes
SHA-256: 07401a422ffbb150bcd5dbfc87943b0a3f22f2fcb5fb52a40d5f2e0230141f17

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