Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c06b42e280112f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-15 12:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8ea51503698dd3dc1efe0b76c43738d0 SHA-1: 1df352aaab964ddfde02310c9e5c28f26968242f SHA-256: f3c06b42e280112fd78e5769dff46634fdaa542f98ead4d3011c72fdb03bbd33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083efb86d23d---fedizilutuwapitenizanidug.pdf In PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/fe0a3ee9d337b36fde88891231048dba/muwoxododitoxet.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/72016967446.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/98921228896.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lapibuworumu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/govogikozavo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sabebet.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608414c17af24---dumuwusoxivufafisub.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/04461ff910a55ab310aea794b57108f8/tiwosefemolire.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/u57s2ap8pl9mflc7ejavg06o5i/pibuzunexil.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1c62d4929289567e6ff7d2aa2a5c5e75/latabileliwivaxumoz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3eb37373d7fff3bf199fd25417443ac9/71829331772.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/94404019654.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xiredevitixujeribuk.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/semejiwinoxizawonuv.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf8d2588---puvepoz.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/panuxixuvixajumok.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/b11dc9a8cba00267b4db3cbedccc0ee0/82052450604.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/fifow.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6dc69246---jenogudaxurubokotida.pdfIn PDF document text
    • https://kenadong.com/contents//files/33493603858.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/belikisikazofiwisaw.pdfIn PDF document text
    • http://coffee33.ru/archive/file/60109772954.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/44864872853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=eulogy+for+fatherPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210713/16261258968047.pdfIn PDF document text
    • 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_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 17040 bytes
SHA-256: ae69acc4654622d2fb53597ca1d880f2feaf1b19592d7abfdf9c7466fdd81499
font_01_sfnt_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 10328 bytes
SHA-256: 6840f70bcdf6bbafa3cc9e2f1e8aa3f22c8a8d4a17c0f914210c7a2a9eb7cff9
font_02_sfnt_off00014822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1