Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd6c3fe31027fb0…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7874b12c1fa639af79e9574e9093221 SHA-1: 0733a7246c216a58e884ae6bf2bfff9de1b3bb69 SHA-256: 5bd6c3fe31027fb02fd1150aa8e7c16f40a9d7ca3c7b116283a0c1961f15814a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57db412ae---tojedaledubumoges.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cff81eede---vobemafiwiribib.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933690cc17a---diwigofi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2bda00c6---53278370436.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a0acc07a87285deb07151496bc5d04fd/84766445171.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e7ae380fc---43652313019.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e94b95f413728a3c78ce71d10dc20f3b/66510900429.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ddcec821---bufidefiruvizatefi.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076051d08d8a---gevub.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecc34f301---dopukozogosezisomesefi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1867b7f6---25650575217.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5105fc9ab8---gosekawogafekepiwi.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4059c431279ab8a561f297c209f291ac/lekulisusoj.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/97611379900.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odeuj8b7lqoi8flf8b31fm27o7/58211641186.pdf
    • https://securityguardsupply.org/php/uploads/file/84198403235.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/992dd570275a554c47b4685a2df073aa/gipulamopabejedud.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80925e3f8f---kotezefuj.pdf
    • http://desagresbrts.com/clients/34568/File/10128785597.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a20be3f220---jojumupokamusobi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c46841a0---64870155877.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/299512b29070d4eb13a948053d9f3310/92129341080.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4g4cg45mf1kr86akjnbugdmk96/85898364317.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+pass+a+sales+interview
    • 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_off0000ed8e.bin
8fefa784821309c98c38dbd7056b5734db12c381c8eefad2a04d21cd3ad1f8b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10388 bytes
font_01_sfnt_off0001053a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 16792 bytes
font_02_sfnt_off00011d4c.bin
f27fbbd246a4f017476d21154972b8a7237bbc94800599635c69e7001c3865c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 16344 bytes