Malicious PDF — malware analysis report

Static analysis result for SHA-256 74934e7ba7b05230…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 08:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 657e264aeb0bf60e690260e3313e86af SHA-1: 803340af4b35e387d9ec14e65a99c7938586c049 SHA-256: 74934e7ba7b05230493e379fd0ec320734a57fd816199189481e87a80aca0f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=eagles+native+to+australia PDF link annotation
    • https://flardochform.se/userfiles/file/gojadubekesojanobo.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/52735210672.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/bofudunef.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/lilinadisaxamokawu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0a694c6---gagofakegasijafolu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95820337111.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/pafezigozabukakusaja.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kokaxuzi.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/58925557598.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/86350621648.pdfIn PDF document text
    • https://estoniapools.com/contents/files/11784935820.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zegenavojerawobuxugi.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613B5E5D1B1BD.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/xajexumebedutes.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/78077126870.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/76384608801.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/624c15fff6a9f677b6cf10237aff01b7/43097328045.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/71556541663.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kibazegabanasog.pdfIn PDF document text
    • http://travellerisland.com/files/vovemix.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132594e93a22---wofexipasideveku.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6hgukahuls2rr7vmfdfms975i1/nivon.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16788 bytes
SHA-256: fcd8774d8a74fb8ae33b54d5b2467a7faaec0379451025561918f9b3ec737126
font_01_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 10432 bytes
SHA-256: ed9116c479b7242ea9931a2cdd3ab8dba10e73877710c8558e93d45994ac6d3d
font_02_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1