Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cfc68db53abb5…

MALICIOUS

PDF

172.0 KB Created: 2021-08-22 03:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 324a8acb2fe38ff5ba19763ebe6a4d74 SHA-1: f7a2a79220053c4fabfc89b6a6a4f8a6c602c0da SHA-256: 405cfc68db53abb5f0f3a4056d69f58a5eb61606757df1ba56fde9eb29d4a95c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm used to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent payload, a technique often used to evade security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/99e248987b2e990e5fd45f2eadba0c25/vitajexupibukufipuvex.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160728de57ec3e---wenikesafigukujosikinileg.pdf
    • http://childconnect.com/swi/fckfiles//file/vapar.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/so5liqn15j9hh14c5591p91nui/zepuzuzokoruvixer.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8b493093c5fcb1e48016dc332f2423c9/fuwasokukutipofidovib.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007a4d36ca2---wanefarepusilo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a19905e28cd---5621979027.pdf
    • https://vialivonica.eu/userfiles/files/70521629872.pdf
    • http://rund.cz/UserFiles/File/paxopejaguxezovapal.pdf
    • http://boathousebrokerage.com/userfiles/file/19182008952.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/99dd2a1a4ae2a3dec67cca5a6dcb94d2/56917894437.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76787bdca1d4272c7d6e3a97e3f449fe/xebapinadawo.pdf
    • http://csc0535.com/userfiles/file/20210728094641_3t32iv.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e175ebc6a3---90016424248.pdf
    • http://amexeuro.com/an3_Uploads/file/toletibunag.pdf
    • https://widepolymers.com/userfiles/file/95701041331.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c4d805fe4aac7bdfcda88c973cb6b597/savurev.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e34821e3901f91d875216741fc88fc4b/3251950623.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072d738c88dd---motoxusifedukelujoku.pdf
    • https://zerling.eu/nico/images/files/danofefanepapasuzuke.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468fbecbad---supefixefonasipinodumexe.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/jisap.pdf
    • http://szentimresiklos.hu/upload/file/9871789759.pdf
    • https://apizf.org/public/file/javutowudegegutimogenuban.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kirby+and+the+amazing+mirror+ost+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020f1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F1F 16792 bytes
font_01_sfnt_off00022736.bin
5654e37bb2180082452972d19dbad197e602d8376f8f846dce1de7c8689a76ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22736 11088 bytes
font_02_sfnt_off000240bb.bin
26d7ade17b082eef6e9d2b2c3cb3a4bb6184da381b2b8686771f3a9cd3ca6a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x240BB 16280 bytes
font_03_sfnt_off000256e0.bin
2b851ca1e7d1612bdfee3094527f3b0165c80f4850ecfe1cc694d1e3e4440ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x256E0 30716 bytes

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