Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cb76e4ff25f205…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 18:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eae48983bffad8c00baa67d63a71c29d SHA-1: 94a050890b3f331efa12b02509072d7309ccbf58 SHA-256: 79cb76e4ff25f205b1e5bc6711236b647b6bbded44acee0f0f15fcbf330bb57c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The presence of external URIs and link farms suggests an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=quality+john+galsworthy+pdf PDF link annotation
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/daa45ef4919ef5850d3004f83cda4f19/pesojogezepiwemazakida.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c63f55e26447108e83e21dafa6f11195/79789700552.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3fcf23b0---gosezesetobediduxonuveg.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/28589885311.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/416325977.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/iqqns377uavvemgq2dgohsvfuc/vujosirafexevisedapenawar.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/97280425611.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0310b113c---82972755611.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/wilewemojimawemofakaguduv.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/9474304237.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/zoritosoxipebej.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eacdcca8---82848716914.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44df76366d.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8c7de219e0f241bc165796baaf0ce74a/jovewifefe.pdfIn PDF document text
    • https://serka.com/serka/upload/files/50997394592.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a77f34ce---41713876739.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/vinibixaputafeginizo.pdfIn PDF document text
    • http://homeopathyhk.com/files/30493283789.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/2857305488.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0877c8d38---39648214992.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/fobofaliwidopunawof.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/86384963827.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rubumori.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 11136 bytes
SHA-256: a22d4e2e92b62d41c41c09764d4ddf92bfde5b41843f7470521808f4e1045dd2
font_01_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16276 bytes
SHA-256: 3a1081a3f254b793f8cc5bf7941b9235837352328243cabf89e0b1d01f472dd7
font_02_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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