Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cdb6ef2bd25c58…

MALICIOUS

PDF

89.3 KB Created: 2021-07-03 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebd0b371b8c556a7457e47d2e4554d72 SHA-1: f57a12b4ea4a23bb112e05c985e5b942d135a070 SHA-256: 00cdb6ef2bd25c586fddaaab76ce6041a6d5d48e14dd7aff38a4e2959e9f9c37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4194c1eeffeb3006520d6e00fc0d6ff3/32769231747.pdf
    • https://artasedanasingaraja.com/uploadfck/file/5851358053.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/010cc82780fb872a15ef5fd55c96a4fa/putizolakatitupajari.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4ad91651aa6b6115ac5c3f42a28e53ed/kirevomawapokotidowufiwa.pdf
    • http://dalboncostruzioni.it/userfiles/files/95457334296.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a7184056ea07ba4eab6f50f009e6ab5/waxofidojenumodesiruzebu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db61f25f9---89305605828.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96a5b32d0---51141256362.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f7ee02b78fd67569285382d3ef04633b/71941256092.pdf
    • http://skikk.be/app/webroot/files/userfiles/files/wizejageropibubokenubowe.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb55a33e4b---55925773882.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u52u5f82goa7e0d2uosqiv1kh0/205528705.pdf
    • http://teraval.cz/res/file/19617870721.pdf
    • http://bjsprt.com/uploadfile/file///2021052300322979.pdf
    • http://ccforum.kr/uploads/file/1624796714.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160994da5a8a29---92763645878.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db334f6a5---70469201113.pdf
    • https://audit-advisers.com/userfiles/file/83429676694.pdf
    • http://accessiblevehicleservices.com/userfiles/file/20577486163.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b533c9139f---83821308670.pdf
    • http://obchodsezlatem.cz/upload/files/39414159020.pdf
    • https://pasarantogel2.com/contents//files/27688943347.pdf
    • http://technoauto.jp/js/upload/files/33783651532.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c401e283c---88847796011.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a769d5474e1---95213232959.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chocolate+cake+from+scratch
    • 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_off0000f7bb.bin
cdeb0ddc5a78ff4e0eb9fa3aa12a67ede1f7c3d7e5dbbb73ef961a4f09710a55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 17680 bytes
font_01_sfnt_off000125f1.bin
5efb61ff49c5054e489d48d3e916b44517be9424bd7cc34df20fb8c35570eb89
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 10528 bytes
font_02_sfnt_off00013e0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 16792 bytes