Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3f6d6dad81157f…

MALICIOUS

PDF

74.2 KB Created: 2021-07-04 17:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eb94f483a36f6b6cdd80d55cab79df4 SHA-1: a64f5f22e16842c1c605d11cb5364b8f06db7a06 SHA-256: 5e3f6d6dad81157fae209e129cd1130c5e2b5c69b788651675ba09e2ddb64e39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1754794529---duraposerizizakov.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/texumojigajagigu.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbe12a528---27851040858.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fr35i53l93lv3vcsusork9884k/fobewepadexibukanavokafur.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/riwesoretopid.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fa00daefd2bc9ba49afccf6ca5b8ce4c/38622400945.pdf
    • http://classicalgardenornaments.com/uplds/file/jukug.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bb4b32373b66e4584113bd0d9da5f5cd/34892839418.pdf
    • http://minutemen-jrotc.com/clients/84940/File/ditara.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02a0aa86b---84733533569.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160deec251392f---16586822216.pdf
    • http://krevue.cz/UserFiles/File/lepapipaf.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rcppcqpphs4mrcfnml3g12tioo/7206940185.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc311554c---6092386655.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e847f59773e0f6a274766a7b2cbf7581/20918427355.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/bilelopelumepebijig.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8peir91mmo0kiivggd97e35mth/xenamidafilo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cb625f0ec29f76cb1e6a4fd62b1d966f/gibeze.pdf
    • https://marosme.ro/hirek/file/zumijesitevilibiraxalinid.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/vitotowapasilawuka.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/lipemizux.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/24204311266.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b9f0e7bd---pobetivefolukasagubi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=industrial+real+estate+partners
    • 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_off0000bf24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 16792 bytes
font_01_sfnt_off0000d73b.bin
336436bb2c43bd6be80edaf3f3c84a7916b236294755b7434ddaf027b66cf7cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10316 bytes
font_02_sfnt_off0000ee8c.bin
2a25552e0431f2a0efac0ccffac7ff08cb8cd3f8afd2cc2a06bb484b1bb60193
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16712 bytes