Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f8453ddf954999…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4dacddfda0ada7c78e53baefade031e SHA-1: 1369ab93622a0df1f517a5c3653f63584ebdff34 SHA-256: 01f8453ddf95499992a208bf67775efb425571f48f4d2e83e5146f8de6a77b50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.greenlakecruises.com/ckfinder/userfiles/files/93482562543.pdf In PDF document text
    • https://floresdeserrezuela.com/aym_image/files/35891906338.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/92225440779.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614189e991ec2---13156673299.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/49491119744.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/11246593405.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/33198328255.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/benobazazigoxemulesofaw.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/77522999092.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/64576557507.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/45926540983.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/batelarim.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109121038117506.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/nelurekaj.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/baxego.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccfd1cd64---62654818955.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/99955965148.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/funixofekuj.pdfIn PDF document text
    • http://wernitznigg.at/files/zunasanujusasanesizukabaw.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/tutikiva.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/mopomuzufoxolixexo.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/4515567961.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tenovabitafedab.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/44468991094.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/matasasageruse.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1dde13a512579b6b5ede72631dd58825/mokojodewinufujamupif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+ball+super+75PDF link annotation
    • 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 17716 bytes
SHA-256: e8f4f704877d72e137ddf988ffbe12ddec4af6726d49ba838162dfe2b5fee48f
font_02_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 10664 bytes
SHA-256: e1103e5a4f03072d4228e8c515f2c7a8d4df2142ef7abd57477d6f16dffea008