Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32a54c4f3bf4e4f…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 19:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1a00f7f3b6d974cb1127d08d484d5f SHA-1: 760ef2a1f9531baf5391c2ebbac5c7e08ffe698a SHA-256: e32a54c4f3bf4e4f345ab03744944464e8b68fd1fa944962a910159c8d3673c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/be8c92f4f50d428e627e2e4ca1612c91/zumerijoz.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/26dra9s4i7mqamn1p99gdgdvt3/nelujak.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5b5e1ec24e339c2e474f0313413f169b/54078563999.pdf
    • https://loctra.net/userfiles/file/rotagobifovewer.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ffc8bcc2---dazarusewarelinu.pdf
    • http://agendatourvietnam.com/hinhanh/file/29170880829.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/96b062eb89dcc214f3a11b218f119f25/73658368609.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3ede8069e075636ccf3ac09deb34eda4/30722350309.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16095d209dde7b---53961906774.pdf
    • http://pphu-joanna.pl/fckpliki/file/19380313764.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca49b46a58---vuwoto.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074475dbee5f---4120642991.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b212772289d---99999606290.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4f8cc565---bigujapifaxid.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a7462dae244a0a9aa6f365ecd41fd7b/63835852466.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e240b528c---36415667943.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160714958082c6---79541406543.pdf
    • http://amirafouad.com/uploaded_files/file/47695247782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+schlage+keyless+entry
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e648.bin
f70fab619dc69e7766868a65b93749994f69d6327eb5c574b5a3a0b6d48199bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 5280 bytes
font_01_sfnt_off0000f844.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 1800 bytes
font_02_sfnt_off000100d1.bin
39a2b2db907750457faa28c589d9e8312b8d9d1b190f3d582dd06e7792700e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10816 bytes

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