Malicious PDF — malware analysis report

Static analysis result for SHA-256 a569526a6b98c539…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 21:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a4cfba146b22ec75ec2a1afe3dadae65 SHA-1: bfb1570e6c34194d37765fa002e857cd7cbfa139 SHA-256: a569526a6b98c5393740e774e0954c2a0c09b5858d047e62d2c8e5c6914a824b
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7482

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=pride+and+prejudice+notes+pdf PDF link annotation
    • http://jrpst.pl/userfiles/file/zijozoludiz.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57027755517.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/xamumewiboserifizojavu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c365c6b8ee---17341577209.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897986a55dd---63274027179.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/34988fd11f7cefd2bb4e6cfca532a874/vofuwobaramumixemaweb.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rr89m659cnlj4ld0bmmkndt46n/jarunulunudorujex.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a000e227183---90959101368.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/72948348645.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/butetezima.pdfIn PDF document text
    • http://northcity.rs/slike/files/sapalurozolufemo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2e968dc384f51cfd77cb3896c323e09b/67296036380.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/61105429404.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/23641228760.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609374da491a2---wuxatobapapepanilemawuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 5076 bytes
SHA-256: 2aa6360d980fefbe6de38922e70a8a4bedb0eed428625a22ce4891ab66b7cc89
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10912 bytes
SHA-256: c4d1df9670c71880c3c0cff809755b951bd7a4415d58969a009db9a0ee4a6f92

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