Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcedc6c88893219…

MALICIOUS

PDF

63.6 KB Created: 2021-06-05 14:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72d8db14d297be7dea54a7e854f9b42f SHA-1: a94c129b252321ff04c5d834e125cc9a283fb195 SHA-256: bbcedc6c8889321967979788ee532298fceade81e94138d8e5abee119a0980d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites, likely to download further malicious payloads. The embedded URLs and the document's structure suggest an attempt to disguise malicious activity under the guise of providing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=when+to+use+waterfall+model+in+software+development
    • https://africanresearchcenter.com/userfiles/file/tudopi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2d141629---vezunazol.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb17d68ca---15203547275.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/24e3632749b6ee2a7fe43581637defa6/57208148082.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/supozapurapewo.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/nitilikixeneduloteb.pdf
    • https://al-farh-iq.com/upload/userfiles/file/muriro.pdf
    • http://jjinline.org/file_upload/file/54118609489.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rstecabdo7fv8ig99k42i02st0/sedakezazonusi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075844c6f4cf---luzapu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hk6tf32gdnft8fomo5ch4j9tqt/faruzodukuvaxupujegupu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f0e57ccec341c7c240a041a1c5db99e3/podipunazalabuja.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nsv85g5jlt798m8igcbc7i5koi/nivew.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c00bd4a8c83582c9ad3c5b7f154416f8/zosumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7b.bin
242e05c7d10f552059750e21bf0a3f884acf5e36c503d8903d6762ec513f16b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 5444 bytes

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