Malicious PDF — malware analysis report

Static analysis result for SHA-256 6633d28e13ae83b2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dfb6d52b7d2fbd211a627fc3d56a939 SHA-1: 73ae7f233362111c7ac408bec652d434c6b41714 SHA-256: 6633d28e13ae83b2f02fdcf2c3ec7ea19a5f0d74df391d489a8eb83b2dedf07f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://phantasos.org/userfiles/file/17057718831.pdf In PDF document text
    • https://mycocoa.org/images/upload/files/51794075025.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19404918781.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/judowozejadowajivalufida.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea2143e30---zokup.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/9459895604.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce59a31---vorawepuzenenulidiwaradej.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/85981881790.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/15109428143.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/9633568516.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/dumina.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/39607728810.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/losakujimalaf.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42411555396.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/27212600667.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nepobatonimupedaruwesopu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/xofusuzizunenowijir.pdfIn PDF document text
    • http://carbontuning.ru/file/ronunebinopuziz.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/29793906079.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/mezujif.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/32962489321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=soccer+star+2020+football+cards+hackPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ec337198363c6f6093f9eace3f03c50/46789737527.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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 17696 bytes
SHA-256: 9a1fed5f1ecce7fe950d3860b0d9db06e85bfbd2b2facf2922f90a1a0e60e76c
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10928 bytes
SHA-256: 4fa77a96ef1ec22505d9baf668c32b36077fb935b5946faf03cc7ef4d4225d2a