Malicious PDF — malware analysis report

Static analysis result for SHA-256 f978fd03a758c3c1…

MALICIOUS

PDF

79.4 KB Created: 2021-06-27 05:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe611acc5f37999f67531628aac5220 SHA-1: b1a5af2a05d2240088a0702e693de82a3e32c969 SHA-256: f978fd03a758c3c1445d78e9e7df8d56ec310be9d8624ac1a5825973e47e45cf
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple external URLs. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into believing they need to download an archive, which is often a tactic to bypass security filters. The presence of numerous links on potentially compromised CMS uploads further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=12.5+liters+to+gallons
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d7a4386c---gifoxagariteva.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/bolusefuvaxebino.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f03123a83f3b697a679c8085f575a387/2484743320.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a861fbe8c54---57043647541.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9ldhibu0hlplm8r6ci1sgnf54a/42919022598.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lir1n1u2l4f6s6686mhofj1u01/wadat.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7f0e25f80---dezufoxixiwufutedeladug.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b5a087e5---mozomuruxob.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609472b8a3b3a---rokujekuxu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862de7e02bd---17062952600.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1552aae75dd77ff566eb6431f968e8e6/repasa.pdf
    • http://glotecgh.com/upload/editor/file/wulexivemirarijalub.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/gorojurew.pdf
    • http://hondasushi.com/uploads/files/26745395751.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ef1db78a---314178868.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/t9edhft5d7e69ir8k9oikaipm7/94838613682.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b0aaa725---gibujo.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wirof.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3efcad94---lelotejewamobaga.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e00e54e4e---12240729842.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6dcd6246253f17a2a4bf893f242045d7/27804558330.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44159fb84---dukuxagipidifu.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37e00dc32---24661929480.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_off0000d50e.bin
de0948682321b0d97af50ed6bb9c8b54ee2de4c2acbe4bc0d83691a62e069399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 16704 bytes
font_01_sfnt_off0001007e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
font_02_sfnt_off00011895.bin
77f46ccbd7e290a5e2807fc0080ac5fd4df674c1c6064fe3d7455f379babb42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10560 bytes

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