Malicious PDF — malware analysis report

Static analysis result for SHA-256 e082f1ee3bc6fd2c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 01:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a2d7dc7f569c701f11d6338982021c5 SHA-1: b61c98105aab4de32ab3caf9e24858c70fb79800 SHA-256: e082f1ee3bc6fd2c523ae541f99b584c3b7fc852ba3d6b187c81414bf0568080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload storage, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious sites.

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f150b9dc2c7---71095778862.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/xujonuwu.pdfIn PDF document text
    • http://parfumland.sk/upl/11926277085.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/24748883970.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8523120b8---39311502785.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/35539731552.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wixogipale.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xosugokal.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vor7k6v1snm4gl4rre2n7t7cn0/wenenebikolotivetena.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/dpcev20242bsotfsmivvl5qr96/befabadiwifofejedix.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/61v2hujbrljvrkcch8ocgq9ih3/15536320437.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/88086612929.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tiviruxitibumutolalagofo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093cab3d6a32---nafinefimejaluz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e52000da06---rigonevodigaput.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/budoroxadopef.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zigizikipusidoxaxopobusev.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/folixazopikefuxaregi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0d0e0fd4---donaze.pdfIn PDF document text
    • http://www.bandungmesin.com/file/vidunawuwezuj.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc3a73fd5a---temugasipazu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608911d184637---37784904989.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/bijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=usance+bill+meaningPDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 18376 bytes
SHA-256: 38f26a4de9ccde8365e7aafad2f19b7ffdf0c688bb86c928993fddd9b77d0f1d
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 10400 bytes
SHA-256: 7de9e7d094b6574a3fbb0020688a3b59e11638c5d94b987bc8308ef354148b59

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