Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bee73bc5947e42…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 23:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10b1eaecd8112c7e646cecae4a1a86ba SHA-1: 271994e20cfe53fb1dde4629012c6f26c792a617 SHA-256: 31bee73bc5947e42f39a09938504c17682cb5930aad16773193e4e891d8f048d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. 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 0.9976

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 http://hastensandbreakfast.nl/userfiles/file/liderise.pdf In PDF document text
    • http://vigen12.com/userfiles/file/rijaxedigudekonisibigi.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/36223122050.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/14799985962.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1103d74824d36f4cffdda08a65a58938/judizowoledulupoba.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/13732645661.pdfIn PDF document text
    • http://tainandentist.com/uploads/files/202109080738412249.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908211551.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/duxanukira.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30318773499.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/11189411808.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/belivawujowimizoduwu.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/76854297842.pdfIn PDF document text
    • http://jn-zhsc.com/upload/27908077167.pdfIn PDF document text
    • https://seger.cz/userfiles/file/nogelikefi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jugelidasapikekawutetit.pdfIn PDF document text
    • https://protrialse.eu/files/files/nedodi.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/67456783976.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905143341_edoka2.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075654fb6d---3798547230.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/begoradezafidumomep.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d9f45f1c47ae543aa0e2a0340f169ba/simivif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=galaxy+s5+hotspotPDF 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_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16760 bytes
SHA-256: e1c33de82d2398cab4045e89e2c66863d50b39e3fb2e329eaa303663c467d0df
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 10308 bytes
SHA-256: 34b8f7317bbd5793064150d9d0b9fe8f49e71a0e21064f08f43aa01c84e76a91
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1