Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4cacb1e227d809…

MALICIOUS

PDF

66.9 KB Created: 2021-06-10 23:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003828124d5676d4160440831ee0e289 SHA-1: df6232d362b356098867667f77e969429b5acf6b SHA-256: ea4cacb1e227d809ac42f5e2e472334dbb89cef93cec0e264e81dfc8de39ff6e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=i+just+wanna+love+you+forevermore+lyrics
    • http://unsersohn.ch/images/file/mawupifa.pdf
    • http://acecaalcoy.com/userfiles/file/15482610718.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/i5vkbacm0g6d7cgb001kq47qrc/31193699247.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a5b67cf9---zuzivigegelonosarid.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/92f911d1e8db71f9e143de79ed96b106/javuduwofilifupupotira.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/04a5bcf51e4fc918301e9f01a60d915b/48928546369.pdf
    • https://numberonerevolution.it/file/23554424314.pdf
    • http://akinmedikal.com/uploads/file/46144551599.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2613436ff---gajiwatowedevu.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8c73ebeb---99284923855.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a15e08210---19155988542.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ba33ac81ac010b7943e3a86143c2e413/21428710736.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/mifh5bb260t6slufvkpa0kpag1/41220000737.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/cddaca35d6f664c73f006484fa27ab38/sidawenovaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c8bb.bin
3630640107dfe265a94c14c11cc1111d8e02ea40d8139509b86a3c1a3d375fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 5292 bytes
font_01_sfnt_off0000dacb.bin
f33acf5a72e0501e7236a1c6dd47681151c94d6bd29ba73ad16bd32d2b18d7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 10604 bytes

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