Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b93456860a2bc…

MALICIOUS

PDF

75.3 KB Created: 2021-10-04 14:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db5ee0a49fbddd978d08cef2f45f34d6 SHA-1: 39bf77bf7c86f098476dceaf7fb412feba0f76d0 SHA-256: b57b93456860a2bcb16e4f92c949fa4f99f6d6b426c0c6584870b6e3ee65a0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve as lures for phishing or to download further malicious content, aligning with the 'Pdf.Phishing.Trojan' classification.

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://crysiq.ru/uplcv?utm_term=essential+songwriter%27s+rhyming+dictionary+pdf PDF link annotation
    • http://eatatrudy.com/uploads/files/79873131107.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/mevijefososukukat.pdfIn PDF document text
    • http://topp.pl/_topp/file/goxuzarawagoxat.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/36884996755.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/38468727972.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/lusifagederoto.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba86e3e42---2618158578.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/82186698708.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/melupufoteniferavize.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/85188969101.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615abe7adee26---18824832484.pdfIn PDF document text
    • http://mousike.it/img_ins/files/kimumukalavafatuzuwe.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/95260978126.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/mekufajedofuxexinow.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nojuzuveturilizo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rumumur.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/68efcb6ea843df40ad59dfac2e132b6e/zizepudav.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/gutefobopuke.pdfIn PDF document text
    • http://synphabase.ch/upload/file/babikuditukogunelu.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/82966434950.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/setigasebaroxadojav.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d9ace084---55117530777.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/81996073136.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/87375229983.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/91121428303.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_off0000be91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE91 11284 bytes
SHA-256: d6c924313754c23cba538513409620b4510ca4bf3812bb697f8a207f066b2e78
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17764 bytes
SHA-256: 4bca3a9c24249ef43a5eab6c980eb251fda823f4d850ce0c66c68186d5d11ae6

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