Malicious PDF — malware analysis report

Static analysis result for SHA-256 95771cc14a2a1ff2…

MALICIOUS

PDF

96.0 KB Created: 2021-09-10 20:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5e8d1054a6162dad0dca0b95fb89f66 SHA-1: f6ad8e8babe3dda4a0d86b8667b020cf6a264bf0 SHA-256: 95771cc14a2a1ff292662f52b91dca38e799b98db167d2b158f8e1a067bb2780
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, with several pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4098

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://swiz.eu/files/editor/97637807320.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23641004015.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/8581146061.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc4d0041---lepegixupig.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac88450a82---7722069694.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/94877241399.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/23900880635.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ditibutibilixir.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/waxifag.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/62279973600.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdfIn PDF document text
    • http://ux-school.ru/files/files/lataxoxefosu.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zokuwuwi.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/xoterojuv.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/50108562256.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/gebizotuzitukuxukelidade.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/lexaxusevadon.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9q4euco09isviobr5il2kjnpfn/wibadaxuwepuzanufeli.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/44573466105.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/setam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca0fd5afd---doruwadebavamazazutuka.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/megerub.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dipefel.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/67822666313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=common+core+algebra+1+unit+2+answer+key+pdfPDF link annotation
    • 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_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11696 bytes
SHA-256: fb6efa8b52af49e708b4264da25615c65d69fa70c79eef18f13cdd2425cbd0c4
font_01_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 18868 bytes
SHA-256: 842ec45920fcfcfaf2a71022105dc71bf74c0e86ed9e1277b1e68ecebe70f1e4
font_02_sfnt_off000168a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1