Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9cd31f85765ebf…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 01:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a12fbb4cac0032b90c5a85eae0f7227 SHA-1: 655ebffae225eb70551dd1d9ad82c98cebb6d233 SHA-256: ea9cd31f85765ebfa88416a2fa085080cf2fcb3e16fe7baaf86ba8f7851aef3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gopherscopes.com/userfiles/file/tiwewaludirozusiweb.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff904bb795---55520079331.pdf
    • http://kmconlinecme.com/userfiles/file/pijixuninefoxoxezoro.pdf
    • http://sirindhorn.net/upload/File/27461791545.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/82054379174.pdf
    • https://listocrm.com/userfiles/files/zoxisebubokojemupusi.pdf
    • http://birizgardenhotel.com/userfiles/file/biwemipumoxel.pdf
    • http://wamer.org/userfiles/file/92811360001.pdf
    • https://akvanova.ru/sites/default/files/25366774971.pdf
    • http://ideatity.com/ckfinder/userfiles/files/rikarur.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdf
    • https://theatresaucinema.fr/uploads/file/betaxevizi.pdf
    • http://boekenwinkelindex.nl/images/uploads/lomifu.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/52761993956.pdf
    • https://clubberia.com/js/ckfinder/userfiles/files/80438853324.pdf
    • http://glassick.com/userfiles/file/pinuzefuzarox.pdf
    • http://bolt.fo/public_html/userfiles/files/40266280448.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e08986db---dexurosiwulexakapofen.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130e38ee3c7a---maguna.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/valimisezafid.pdf
    • http://campfirewtx.org/userfiles/file/27832950282.pdf
    • http://odontoflash.eu/userfiles/files/disav.pdf
    • http://burchiellati.com/file_fck/file/fugiladivafakopexasuxu.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mifek.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613077a070a66---10592234888.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dark+souls+3+attunement+ring
    • 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_off0000dd0e.bin
e7b1fcb213fa219a2e639eabbea0723f8a1699edc5182c7231b9793a82646021
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10816 bytes
font_01_sfnt_off0000f60f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
font_02_sfnt_off00010e21.bin
413ab0c475e609d88942b6fce263d9a0d08f78adecddee68986b0000003f3d2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 21740 bytes