Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bff14eadc98fc5…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 08:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d6a33c042f7cf8ad447db6f268e2d8 SHA-1: 244e55d0eaf8773834f59bfcc06aefa62fdd5d9b SHA-256: 84bff14eadc98fc582ed69bc025929fa599e1f9bd03173aa8268376ab979c0df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites. These factors, combined with the ClamAV detection and ML classifier score, strongly indicate a malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/01b05b93c2266e13132cd36655bc26ae/redijonurodobuviran.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9740cadc24eca0aba4659479110bc03b/64983851775.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89b6825f---jakivafesufe.pdf
    • https://stef-nancy.fr/upload/document/12576589695.pdf
    • http://amphorabeautyclub.com/campannas/file/68680758941.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/069f7e6e6818d95a8b87940883ea09bc/63314015213.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/qeu2rmsl112me9qpo7qha9mc6o/xofufoveriwiz.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6765f17a---25059426558.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c53668a6---kisutaxak.pdf
    • http://limoride.net/gallery/file/32956738621.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/70a226e4b37a3bef9f7582edc6996d03/51119753350.pdf
    • https://erdemlerkoleji.com/resimler/files/60055407826.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/xogav.pdf
    • http://sarlampa.ru/upload_picture/84026234076.pdf
    • https://rocksoliddesigns.biz/userfiles/file/palamozoramenizovori.pdf
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdf
    • http://refinerlink.com/userfiles/file/56752737476.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08407eec12---luxalinejukaki.pdf
    • http://buddhavehicle.com/userfiles/file/xonifevinuxeliraditime.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160896f2fab993---77225569197.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c6ab191503ae85cd2b3d1aeab336ac3e/50989094859.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qn2uijjie114lfddh4e8h3t86i/70556038995.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/c82lsvvenep526s6ra97c22alh/68948202087.pdf
    • https://micsys.in/userfiles/file/vamuziximifif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+giraffe+and+the+pelly+and+me+poem
    • 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_off0000f466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 16792 bytes
font_01_sfnt_off00010c78.bin
d522ee64d2a53cab3c9f5ba3d2ef80214d694982265f47f3f7e569f7e25b02ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 17068 bytes
font_02_sfnt_off000138fc.bin
e843565ae5e7a1166ecb27ab09ccaab6516f10ec9cf5c826a19b9d0dc892aae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 10856 bytes