Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af43ba1de7221f3…

MALICIOUS

PDF

195.2 KB Created: 2021-08-02 17:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af3a359acb0ac244386473bba9bdc7e9 SHA-1: 32913b6424651188feb64c4c724b080bccdc6841 SHA-256: 6af43ba1de7221f3474c0cf58f3f7b528f39ced78b61f8b00ae64ffbd5ff6fe3
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. The document's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5292

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://chanhbon.vn/media/ftp/file/35316435792.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/23650621352.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7e72608d5---38463961859.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/raxatukuzujunabomeda.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609044a5b867d---pagagawumizimiga.pdfIn PDF document text
    • http://secretinvitation.net/images/files/95765769087.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7plj7fe1lv4o0iiq8jtq3tf1k6/porinibigabusivozabowaziz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/32a08954a1f9c71f175f1c991212c5b1/xuwip.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/xunoxefaluxexosek.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0a0f06bd094bcc596180fe761f65d623/88702036590.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/96342405475.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/40760704966.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zuxurani.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7541491d00---59392967276.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6e00e5e0527e8b8f8491d5efde40d802/zenok.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bosifevezijibamaxupi.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/namesaninetama.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/neluvodonuko.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbcf09572---33390481854.pdfIn PDF document text
    • http://erex.hu/upload/file/vomuvanipipotevifurara.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210621090621.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/xidajufazesenirod.pdfIn PDF document text
    • https://atiksigorta.com/files/wefekimibux.pdfIn PDF document text
    • http://bdn10.cz/files/file/47598864409.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/38943104700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=el+peque%C3%B1o+vampiro+en+peligro+pdf+scribdPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a5885174cd23e0ff9617208315d36b86/6634885902.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9FE 11508 bytes
SHA-256: 508cbf33dd51d6a378c7fc4df45793320847f80de51bad28e28024fcbb74c69b