Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef252a7b3442b28…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 20:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d70d2698950a47b1b8b5cee9eb04854d SHA-1: aa20a18ddaa085466e21c8df653e5dd204867efb SHA-256: 3ef252a7b3442b28502c557d33eea6e7f5759d07d6ad8d83b15b0dc61bcbaedb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://konferencii.ru/js/ckfinder/userfiles/files/niledafemup.pdf
    • https://partner-support.net/user_data/userfiles/files/14824156111.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3713a09b---92153086852.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e274745c97d68d5c9927ce959b030052/desojosaguvuvosajud.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/240f1266ef920dce58a54cff0e2bbc17/82850004764.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9fdd2609e4042cd0496bb84e78b10280/xevufejebikezibobudu.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/coetcplqdd00el2d5mffampuuv/gesutelurifixerabakasete.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ea75ffc74133474a17fb8f2d4953266/vumelasotufedexi.pdf
    • http://xiaohecollege.com/d/files/wupiwawoloxamedegewazeka.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c19d4e025e1e9ead32c9ac78eb7fe77d/57121418651.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8d23kpj1uvj73qag4dsrq1vj00/95160575985.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160780cdd0428b---23004622748.pdf
    • https://iamtimeshare.com/userfiles/file/75515421389.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64c8c292583c464cd882161678fea4e/34496694749.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c62e46f22---88051297993.pdf
    • http://ipceurope.eu/assets/file/43322294838.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4b644758---dufilofinafotaxe.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849a622d0ec---vanusevokepelijav.pdf
    • https://asset-books.com/userfiles/file/sumox.pdf
    • http://www.celso.org/download/gefanidiga.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c6020017---vesinet.pdf
    • https://charlesstreetvideo.com/userfiles/file/64936898763.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spanking+in+movies+and+tv
    • 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_off0000f4df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
font_01_sfnt_off00010cf6.bin
adebc3c3652a6dd15ee41270afeb9741e361c886e558be930cc9041af7198bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 10824 bytes
font_02_sfnt_off000125c2.bin
7872852f35ed0125b89b2dd340bea022770f97f7ef94284ef3912cf412b23b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 18044 bytes

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