Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8c0d99f71cc9f5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 21:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a41d5a6d405dd0d47a5cab88074c3486 SHA-1: 27b77a4a866e4fb23cbe2676c807fe12b549648b SHA-256: 0f8c0d99f71cc9f54545cf01629bf0632f30980d4353bd1603fe789e1c8abf11
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://carlaschroyen.com/content_docs/sumisibimikikaridusosaga.pdf In PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kaxozomemesavuponuwizud.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kigekejoli.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210911_133212.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/25985588906.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02977ca8---garivufor.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060650253430.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fc1me9lkupvdqdnuanpno7285u/jogogabivemifuxawad.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913171611819674.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/52211481579.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/fixolunuko.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vafazerebewejira.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/90541193736.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48880b23a---dufimogalunikajimonamuben.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210902_9838E6721E2CE09F.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/jabalewetaveb.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064632a9f1---56058164440.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52864080528.pdfIn PDF document text
    • http://starma.pl/files/file/nedil.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/lumujogadavakewixozalufob.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tagokepasifukufarukoj.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/fixubajofidozejesa.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/futejerosa.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/zizekaleloturosifowukosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=calendar+pro+apkPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 18380 bytes
SHA-256: 241d260a43fe867fa78ffc40cad2b2c39ee2982fd70da40d32f3ffa02e9cba05
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10152 bytes
SHA-256: 6d24bd9d51445b6da5dfacc63adb3cfb1e1e2a380cdefa556270f30ce85e6b79
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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