Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e5e56d7b8aa9f…

MALICIOUS

PDF

71.5 KB Created: 2021-06-14 23:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b55b8f24d5164c0c2fcd5c1440cfeb4c SHA-1: 78913aae55d53dc5e517950ab09255a926c85268 SHA-256: 633e5e56d7b8aa9f4f85469dc8bb9ca7dc605cf431a707a837683f11c59381b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for malicious redirection. The document body, though heavily obfuscated, contains a URL that appears to be a lure for pirated movie content, likely to disguise a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=abhiyum+naanum+full+movie+tamilrockers
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9928361f---92556858486.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f498d69b---63544877615.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080072ab6693---kosatun.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7291811e47a1fd6d3afb9bb9f4a44c29/66160458962.pdf
    • http://rydelko.pl/userfiles/file/31280454712.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753fc68d5d---54057395400.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/000a44e54e35f965c0a32aa393dc21b3/xejuxitupufus.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/dolaburomasitasom.pdf
    • http://bajcsidavidfoto.com/_user/file/32130528320.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/126a3eb1cf50d9447fd0e50de26bdf96/gobujut.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6ba76448277d2b17c1febec7eaa15925/zemutarifuxafokevuzox.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d6aaf707e2c7e47c790e74fbf3608628/82219803403.pdf
    • http://splogservice.ru/content/file/4607042114.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b029a59a2ea316c723688fdb5b91dfbf/nevejudunupaterixisediwul.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba986d9129e---mebug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc0.bin
efc3df418b86b39f57881bbfa0857b7140eab5347284ec09f157d2d7179eb29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 5356 bytes
font_01_sfnt_off0000ded8.bin
90324e6a613ba74dbef182aa89ee9bb31b10160ef014a8c3d51bf71bfc5b5ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10620 bytes
font_02_sfnt_off000102f6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 4324 bytes

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