Malicious PDF — malware analysis report

Static analysis result for SHA-256 175eaed6cc14c03d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 11:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: daa8a5f38618d03ff62650bff946e838 SHA-1: 486c8ffbe2713cafbca5f95f70029bea6b8411ad SHA-256: 175eaed6cc14c03d61d51c70813866e8c68a6cd881fa01eb99cdd44f937059ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further PDF files, likely as part of a phishing or malware distribution scheme. The presence of numerous links to potentially compromised CMS upload directories suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/71aee44f74e6b7fdc211236cdad09061/vegugisagazalazi.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3dfd679f4---10750067166.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de14f80c87e---19155639967.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdccbb1f0e---wakufenujefekapumibi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be4739d17---44237407341.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/fozokexinegasisatevapigiz.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c845d246204c5a4b54214a5a7c66f7cf/50306521199.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/bozazisufugasanezo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/92656483885.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/luwajupubeja.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/36432787109.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hbq6ffii4j02c5mgadhl3m8f7e/wujezegajuvux.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/66427373128.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/livejifusere.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e9d3c774---42333142575.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa0fa45eb---nanako.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5cfbe9eb---79979402642.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/54540591053.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/41561491418.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/14026243844.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/600f3aba55eb3122d870842b757e236a/pudufewajarotevopibim.pdfIn PDF document text
    • http://brlairport.com/images/file/93088769020.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/23413167896.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qkg4g7ogbubkb92cf89kon6s9j/zejisivadofekeledafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sociology+is+a+science+discuss+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_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 10884 bytes
SHA-256: b6f064a8028a8b26656d9b98897ecf23282aa8c9354d24a545839525b1377c66
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 17168 bytes
SHA-256: 0124bc66561c9625b39055967d46d0a8b28de4a741e0ef6c92ba6cce94a7e21f

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