Malicious PDF — malware analysis report

Static analysis result for SHA-256 416c47747bbd2c10…

MALICIOUS

PDF

88.6 KB Created: 2021-08-11 09:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 91303c6497116a0ca88cf8f969d0888d SHA-1: 18d9d47f0675176cca1e624740f0201b773199e8 SHA-256: 416c47747bbd2c109f6970fd6670b5cf9032e567d559645d9b5b8cbe87d0abb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to numerous external websites. Several of these links point to compromised CMS upload directories, indicating a potential for hosting malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://aihr-iadh.org/uploads/FCK_files/file/bikiserufozetiguzudigiwos.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wofededorolutij.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/35566339513.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d44e28c8b---57615031750.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/266c99666b07c16fea8bab6e452ec83d/fetaxoliwulimawurame.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///1097546689.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uo37cpbg95dc75h3cbfmk4tga7/82019425900.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/80824513121.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/4023553401.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/34766557999.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1d01fe3e---fobasoxemefukobovakejex.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/29978364110.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/28f03d82f370c24f3b82bd0fa4a59f06/68584850849.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/liboso.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/ligetizasijojujowikewuke.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/fepig.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb765ed40b---jovevafafif.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/lujakojepo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/fa28e75ddfb220d28cb3db615bf96548/57109558825.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31df541e9e---25169019114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+de+multiplicacion+de+fracciones+resueltos+para+secundariaPDF 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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 18428 bytes
SHA-256: 661f35a6ef34db5979a533d4a3ade2ae842305e7981de04bca1314590c82310c
font_02_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 10992 bytes
SHA-256: de2b48416fac0133ff2f3986703176e2b1a1854b49f276e3105f4bdef04f3579

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