Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7b4a07d9f9af7a…

MALICIOUS

PDF

62.5 KB Created: 2021-05-31 01:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baccb45b8f1d27acc717bd6a671b750f SHA-1: 07c03643616e923b6fb7eeeb03ca321f403812d0 SHA-256: 1e7b4a07d9f9af7a5cb139c90fafa588fc63fb9c53fffb0896df20c090fb4d54
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7500

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 http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080db64b232b---56348630096.pdf
    • http://pphu-joanna.pl/fckpliki/file/fujikunerulud.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f1730957a58ac7a13783f95fb1410d1/53199106925.pdf
    • https://acronimocostanzo.com/userfiles/file/75726907852.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607668a88de73---jinedexemoxadepeno.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5d652b4---29333995406.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4338f77dd3556c3db19513e0d220942e/19160531866.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160828bb279826---vupodoxofi.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5bab3c11---60348399332.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7tqcteuq8f6tp84baqqu8prlad/xexumedute.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/78ef2de6927880b62a74d8976b8b340f/28318330443.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a55de6c020f---69483337514.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/715d286d84044f7c88cdf5142dff465e/29175039524.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608600e8b2244---23006774216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+a+pro+bono+lawyer+in+nj
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e5.bin
06cde1081884e9cabe179ca38f98a9a9b87b20fbcb8a2ef2875f3242e91578f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 5228 bytes

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