Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6ce8ac254b5611…

MALICIOUS

PDF

63.7 KB Created: 2021-09-22 17:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9fbc9ca258202ca8977bbe98e6890f7 SHA-1: 24a8e15b0fe2754d4a2c48dcfbdd6f6ab647eb24 SHA-256: 9e6ce8ac254b561102809e468aac9b232e8d9909de482f8a21c4d856ade9016a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://infrive.ru/uplcv?utm_term=hidden+settings+on+android PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11fe1ef96---13573438553.pdfIn PDF document text
    • https://dafelia.com/files/fopevamop.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/24831459941.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/26173053912.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/25892408668.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362d51a938e---vizaxadonugezab.pdfIn PDF document text
    • http://93564497.com/userfiles/893272461.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/40306276758.pdfIn PDF document text
    • http://hexindechem.com/upload/files/keginixevilukowul.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xorirakemejasobebivenetal.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/penemujogoditomuf.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xonaluwa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1c82593c4db8263c596e66530b97eae9/83913182081.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7b2fc4977f71fa0325b89aab6f1c83fe/wibipopat.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/40952344625.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87857065211.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/2453608859.pdfIn PDF document text
    • https://hobbypet.cz/files/file/66617430175.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/33193920524.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613096052a024---vivebo.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/32165332154.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139672b33875---77058706710.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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