Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3bd3bd74f875f…

MALICIOUS

PDF

111.9 KB Created: 2021-09-07 17:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c081267d03cf55306dce0c529ccfe2c8 SHA-1: 170831ab0d6944f394cc25fe7f3e45b3b10c4398 SHA-256: 43d3bd3bd74f875f2f3cb329bfd7088cb77147af6c630993084a38195a2cad43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

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://nhhs78.org/clients/63854/File/jisipaxijaledon.pdf In PDF document text
    • http://baaningdoi.com/file_media/file_image/file/zedejipisexedusejake.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a6b7eb946---denus.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/12789956996.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/84bbccd88de21cf4a22024365ab2c635/jamokexanixebenin.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/geziveb.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bdf34ff4c---sewuj.pdfIn PDF document text
    • http://texmet.pl/userimages/file/kenadesotutazoja.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tiranunusepeve.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/72596616047.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/11761559047.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/74670546942.pdfIn PDF document text
    • http://skrn.cz/pic/file/97084271694.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b23ecedc2aa18d70a618669bc512892e/bikikimo.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mosuviriwus.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rl5s62v1s5415g57hp5jkhmbif/kakupanube.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee9a790fc---44862455116.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/93110722499.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/48752588805.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be78ad991be---14107764450.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/99694736563.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/8df1796be1d88c4c00f1107d9bdb7dd8/jevujenidefisojadadav.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096484e2e53c---29765996912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=malir+development+authority+application+form+2019+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_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 11452 bytes
SHA-256: d6cb32077779b0dfd357bab46e0eec397a88449ae1ea3d2c9be152effd88a6c6
font_01_sfnt_off00016304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16304 20788 bytes
SHA-256: 4bb5287124bf8630a5ca179e074d1703cf894d4abb5324644ca6bd4364e1b7f5
font_02_sfnt_off0001999e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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