Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f543dcc1b7d75f…

MALICIOUS

PDF

59.6 KB Created: 2021-09-29 03:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8a800616b2b8afb37a34a20cf9e375e SHA-1: 66a976373992607daecfb8a06f25413a16b04db9 SHA-256: 64f543dcc1b7d75f468d0f8865360f18aa7f4e06fee05cb1a26ab30c157d9633
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream 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 delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

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.
  • 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
  • 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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mg0uva68j4avnr862vktbc799u/74927360975.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cc1898f8961233ae1d4147ed55fb01f9/nifawabipifuxupisopod.pdf
    • http://belniig.by/public/file/kodigatoduvejume.pdf
    • https://legend-chang.com/UserFiles/files/97372708306.pdf
    • http://srcchaika.ru/files/uploads/files/84274562579.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c6e0b7e06829def0b771fc9844bcc74b/3767941481.pdf
    • http://dhf-china.com/d/files/87456707378.pdf
    • http://kingsauto-bar.com/js/upload/files/meloz.pdf
    • http://bienbao.org/uploads/files/dajujavozawabofetulujesiw.pdf
    • https://factorysales.com/userfiles/files/ronopawuwifadiwu.pdf
    • http://kruengrangthai.com/files/files/takiwe.pdf
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/pekiribofir.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/muxafeje.pdf
    • http://ibb-online.ru/f/file/sugasemo.pdf
    • http://premo.at/userfiles/file/zesefuve.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614090eb81460---meruzirajogesewu.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zasikir.pdf
    • http://backupcenters.com/userfiles/file/70360683607.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/dupoxexalemomujumido.pdf
    • http://dison.cn/filespath/files/20210923070948.pdf
    • http://eternoohydro.com/d/files/tuwibunaralatidemitizisaj.pdf
    • http://ketoanaca.com/uploads/image/files/jusipuluninetififijonomij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=flo+app+download+for+pc
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D8 16792 bytes

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