Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a5b5156658c138…

MALICIOUS

PDF

83.0 KB Created: 2021-10-19 23:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a6e32344d6f57a6ec7a6c5f4497298f SHA-1: 6b8bc7cc69d1b685abf9591e283ab303e9e505fc SHA-256: 00a5b5156658c1381e32f882b52bd857fc73abbe2a1df96830f8d05246f0af17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161e3a1b9fe0---pigagibuvife.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/pekofazun.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/39030198406.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/13842868925.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/dekudeno.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/kazagipomewodamoroneroro.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613366d1b45e2---pamazaponelomujuxe.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jaxatavogimotipumuwaxare.pdfIn PDF document text
    • http://kme-kme.cz/files/file/21034137278.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/bixukitukabifiv.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec5073757a287c2d8130a3ea39b1b00a/vufanasukamop.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/rujisojiwiliz.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/daxajubaguvum.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a47ff439fe---wupopitomusarugomaviwej.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccb7e2da27---mipisikim.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/26078579129.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/rezimijovoxoripapegaxe.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109261106505171.pdfIn PDF document text
    • http://skncn.com/u/files/tanir.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16158ca438d4e9---zujexivego.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/diwenovefifeganodoziv.pdfIn PDF document text
    • http://keitbg.com/images/files/zuwilomoso.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7abf932876a9542c8fb7a4e3891ba125/43204392699.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=what+is+awb+number+in+st+courierPDF 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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 19388 bytes
SHA-256: 07d64276977b570676f7708debd9d5af6cc15135d86a23cc475a0d5818ecb8a1
font_01_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 10768 bytes
SHA-256: b851a302606c47945401e5f0c441d5c5a016d58eee34753beb32d94e27ed9353

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