Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e973cf400bd0a9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 13:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc9432dcc283c4e979841d45e29bccbe SHA-1: 91513c66247f1fa046c912b040139ebd0c826fcf SHA-256: b4e973cf400bd0a9b7fd8e5e1389a1d6cbee40e951ee78b58dbb1d48a3fcf1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://siroyensao.com/upload/files/83938488853.pdf In PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/maxotikapuluzitizo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/32945166bcf0eef184453a0854e6cea7/43856091075.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tadije.pdfIn PDF document text
    • http://www.og2c.com/images/file/zudewe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146584ace08f---64649962027.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a26e4af0---47657162934.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/88194712692.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/8144932666.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428c539c4f2---84568270847.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/63728123282.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/53230398736.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/10947077205.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/31751535147.pdfIn PDF document text
    • http://specimport.by/files/files/40751773554.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/ranekoxezezifor.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/67576666021.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s6ttk9un1df34r9qq4nt3m0dku/9317102459.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/fober.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kuruwolokumebazibavikudo.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/99602361686.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d4f8bd964f7e5edfab739214cbe71ef3/12742146085.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vosokakagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=galaxy+store+apk+for+any+androidPDF 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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16304 bytes
SHA-256: e9fcfdfa94052f16a5547c00eb55fada10001b73c07d362da0a25283364854bb
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10840 bytes
SHA-256: d0f2c776a5f4591f5c33439f0eb8621ff0f76864b6b3b85783af07f1d222bf1a

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