Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd1f3a008bab3f4…

MALICIOUS

PDF

91.5 KB Created: 2021-09-16 01:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e3fe160de2e3b63f5b6350bb70b200d SHA-1: 2f0009d733e5e7cf356f44c11a218155435209b4 SHA-256: cdd1f3a008bab3f42f580da2097db2a3905a6deb017475a0cac14993a7a6deb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.cbs-emballages.com/upload/file/dadilajibel.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kibagobajoxu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/zebirudanegegamubizibul.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/oa7nl7dmced30canb06eg08jv6/kulizovaxanirinalazowe.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kunaxesitakufobe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/08vjhi7hs9loi6ghql7odrru91/palivememeso.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/18499554615.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b264a5907c---sigonojajogojuserubavafa.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/bopomeranixebodumimowin.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/65419126143.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/30635995418.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090506294773499.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/nigeromojelimajip.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/31754554570.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/75940071093.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/99748557747.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/ketoretatotumakizebubepa.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nivusenovareferadupoj.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/9190938213.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/95710966302.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vilaworelor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=9xmovies+war+full+moviePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/9798385343.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_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 17228 bytes
SHA-256: 94d35dcf8b8d72571af36303b1f42846f749dc4bd2befc34e7bfaae9a8b3464c
font_01_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 10600 bytes
SHA-256: 8ed032b01ee7400ed9e8a392d78ce1273aa9399441b70aaa17e45c91281aaaf1
font_02_sfnt_off000148a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1