Malicious PDF — malware analysis report

Static analysis result for SHA-256 945d9a400f97c01a…

MALICIOUS

PDF

77.8 KB Created: 2021-08-14 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97a2fec5080b55acf1b292256b3b29dc SHA-1: d7003f4bbbd218fcd36adcbbf80df1c1b5499d6e SHA-256: 945d9a400f97c01addb0e6c0d0b2dec0068b80fbe807bb46b4a4709efe84b78e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a phishing campaign disguised as a passport application form.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=renewal+passport+application+form+download PDF link annotation
    • http://centroolosprato.it/userfiles/files/lejekowunarujudanerafu.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/73840904643.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8757e4d4c---70826289016.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/69939556149.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/13285666652.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c669f955594---91945904937.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d611158785f---99358431199.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/91187337961.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/22740804892.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/86047166707.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/32088202771.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nezuvuwulugogafazesekup.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/pupukuwubuvomida.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9q69ff392elh4fol00nmecl100/81159836289.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722e6da810---ninajusipipevuj.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/fipobubenepesapuxim.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/33579178011.pdfIn PDF document text
    • http://sjanzee.nl/file/milomevuvoxekuneromu.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/votepixazekufedikijos.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/51958598447.pdfIn PDF document text
    • https://gangnampools.com/contents//files/kokosu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c8818bdc371c3bf443e684ad9e42a8b2/sezejenotogem.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_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 16644 bytes
SHA-256: 9eb8347d4070155820bd2df317f4d185a82bdae5a1e36bf49f45cae5f099e703
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10912 bytes
SHA-256: bc057a945c626550c6a03e3cff47c7518aabe2086e14ce01db28b4224db9af62

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