Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6c3bbf8ca3467f…

MALICIOUS

PDF

73.3 KB Created: 2021-05-06 12:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85def3538df0a06f97e5ba4792c0e7af SHA-1: 760046b759574e6e2ab4fe34c3af247351323af8 SHA-256: 3c6c3bbf8ca3467f48ad013626a7c967f19c02c2af3941f810db6b3cba791834
126 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/24733b547ce2d1741b4401c170b84a66/zopupurob.pdf
    • http://alituncer.com/userfiles/file/dojanafasi.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/0314cd296403a8600b6cc13caa572ca0/11985735968.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608896cdb22c7---98803400716.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/460851da5c798ddb60dda03185e3f260/17596470735.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6be2df852---38059648066.pdf
    • http://adamlegal.com/userfiles/file/75262890989.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/be465e478e0c97c7bb62af8b21798364/vilatapiwumebunukatuj.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ce337496---musuxabudalu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f372114b9---67716127447.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2f31ff6c---sorolut.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/498389487ad4e0abd48062d0fa73b5df/95273430746.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/c3cdc046e0809016501649891caf3afd/41905298018.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/56d017b36eeea1f20d771da245af709f/jakovojumiluz.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ft6ma0s6pgfutia8692m8a7e22/24340510226.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde8f175cd---kadariwobuxewikofibim.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6e488ccbd8d072cd898a9259a350c950/87723302635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=friends+song++pagalworld+320kbps
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf9.bin
115584384859696e105d3d1b5813c7a913aa327d886494e5a1e944e3f6512c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 5816 bytes
font_01_sfnt_off0000f0e7.bin
6b6709c878f937c20dcc1f2776cd22b51ac3fd085a3fcf53c7b2ae5a1aa6500b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 11020 bytes

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