Malicious PDF — malware analysis report

Static analysis result for SHA-256 96da04505ae1bd5f…

MALICIOUS

PDF

72.7 KB Created: 2021-06-18 22:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d5669e85908a1cc4d2785b8582436f6 SHA-1: 710c8749d995a26a1a1d62b5bed69fd9f2c795a5 SHA-256: 96da04505ae1bd5fd42417ee32846ae38aeeaabdb4728cd8e73cc39d1608c834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The embedded URLs and the heuristic findings strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=japan+love+story+cheating+wife
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/4dbb974960d6135ffeb5bf76888574fb/tudiximajepo.pdf
    • http://tutek.eu/userfiles/file/60295707056.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160789dae6a008---63800066538.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c69637469---vamejefogaxovewo.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rgre4gijhocvd922esk403hv2i/79083287714.pdf
    • http://lapenya.cat/imgjovesnaves/file/kopuk.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d255de2389---vikatibinas.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160963079458dc---rixotexemadizaveser.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078228750a33---vejewipolubuxerob.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8396a0d83874cdacf0d8c63407a2898b/buxuroj.pdf
    • https://bandai-k.com/userfiles/file/ledoromela.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fc7aa248---zobuvarebutawejos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin
92d288233b82b0c575f3957a5d00a4e51ff848a5912fdcde3b8171c36fd74127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5520 bytes
font_01_sfnt_off0000f960.bin
7ecdfe3fda33622517f323994633fabc00bf97e89de9c1c37afe7429449e226c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10496 bytes

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