Malicious PDF — malware analysis report

Static analysis result for SHA-256 85191a36db145684…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 09:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c88ad6cceb7b235378c9fd9247ee7bf0 SHA-1: f5d94837d12239a54bfa3e66442cb2f6e04ce48a SHA-256: 85191a36db1456848f94cbff6cca6944405e8e29f01e1d9597ef57a0554d0d39
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier with high confidence and also detected by ClamAV as a phishing trojan. The heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, with a specific heuristic for password-protected archive lures. The embedded URLs suggest a multi-stage attack where the user is directed to download a password-protected file, likely containing the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://gd-weimi.com/upfolder/e/files/20210721160213.pdf In PDF document text
    • https://warungmimpishio.com/contents//files/ponepakevebezataviju.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248de05f1b---xukexokawilenib.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7372c12f---bomalatek.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/30bd5db74f87a6be88530e0a2ea7b688/49115067378.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cae5468f---28177715972.pdfIn PDF document text
    • http://fedime.org/imagenes/jotilesafinekufisofobikes.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/jukugesopogu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/zetizoxov.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6cd61dac22a789d4e6f18a3d6a1b9b09/gudegimetof.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bed29f39b---78276391802.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/62984491949.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/zudejam.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/fabowovuzugusanabededi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bcff0c55d1f0bec4d7707e7dfea4e237/39195924848.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/2523019513.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083964a3441f---82062092396.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/gosike.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/37454508568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=programa+para+unir+archivos+pdf+onlinePDF 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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 11136 bytes
SHA-256: 56460a7ab66805149404884c26aceeb39b507db108a64f3cc39df8be31063926
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 18728 bytes
SHA-256: 921cd16646a7fae3b0fcd7f9019a80a8b4555b2a894b2d396a630c4ebe26666f

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