Malicious PDF — malware analysis report

Static analysis result for SHA-256 4541b6fe80b6a79b…

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92a37e44645cf6737bcd83f5aea7e8df SHA-1: 1112cab38013d83804965692134312eda6ab9041 SHA-256: 4541b6fe80b6a79b41a9d261681daab6fc638184acccc6f36e188527498595f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users who click on the embedded links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=aluminum+number+of+protons+and+neutrons
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b5b92a6---66869673526.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34cab5a68---laxowupudimojigezitanenof.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb4f1c6ee---javuf.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/92cb7f370fc844029679dd964f112866/sukidetigomi.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/abd54409928fd32cb5bf7eafdabc4ee7/52571271309.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080386d8242b---68572658191.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/42h2a9mpbcpfjcjohrd8po1bea/tepesumu.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c9adb32de46219471a14d8dd3dc010bc/47018496212.pdf
    • https://bbpartner.cz/userfiles/file/gaweg.pdf
    • http://www.allatpatikapecs.hu/images/file/vobolu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608080e54b391---395201107.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090405f9e8d7---93106731950.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac617a68340---80418825437.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b7.bin
ecdd21a74a1658adfdbb033284030c67bfc2b968a64a30d9ffb9ead452d3dfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10880 bytes
font_01_sfnt_off0000ef9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
font_02_sfnt_off000107ac.bin
f9a5b74cd457b89f77f87e4df0bf63b7f59a9111f299ae5627a10b0b71a5dd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 17948 bytes

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