Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dedbf5099cb08ff…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 19:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4457971f23f76ae96c81dcbab781fde SHA-1: 4f0f2d7fca93f06effcb021e03545067ba2c5d8a SHA-256: 9dedbf5099cb08ff7af769afea3ed1388647ddddf4e33ff623335b5addd29fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ksujgomtqcb1tlttif3i7oaj1/64555794496.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3gj7p7qrnfpn1no81ii7n9na0b/nomomuvajirevokolife.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/runixurimili.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/69788263145.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/2296356077.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b273d2ef0b4f31b188e0eae222db736b/64507475879.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80247805745.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3471238746---jibumivafojafupogenudipo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/vusibenunapafefuzajatol.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wamesufu.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/38637532494.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/41834510881.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/sumuxovitobigoxumidofu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/6f83e4d55c7ed571514f664a126ae05b/18058492127.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/89906310972.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zivizemoxifadavuk.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///ziriguv.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/piseku.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a8c07cde---soxigisikixufuretowapeli.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/xepokabime.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/8636907049.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mukazunazajivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ghs+pictograms+pdfPDF link annotation
    • 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_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 15776 bytes
SHA-256: 231d7028e3e557416241e3bf7ace7a1e7e1c00e8418d55b7acefb826ec5df09f
font_01_sfnt_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 10824 bytes
SHA-256: 648de926891d528e25bae99c48f7109339957d89da60e2ef4e0154837764fc39
font_02_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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