Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699530304dc5656…

MALICIOUS

PDF

83.6 KB Created: 2021-07-15 20:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5b2c9e7db5e81526ae837c6064a4b87 SHA-1: df1d433b15b99db2137169f68b6976a16dc65f06 SHA-256: c699530304dc565614a1b8e7982d038b85c0e47d19c031ca582718d19f0d81b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or are structured as link farms. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into clicking and potentially downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=pre+settlement+status+contact+number
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a0fcb155e478708ac3b0886ba6081475/tunutuzosukaledezazibe.pdf
    • http://4reality.cz/userfiles/files/12622054690.pdf
    • https://albizy.com/ckfinder/userfiles/files/69697901717.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qi7gaeksvv2bj63isi3enm4j55/60095213495.pdf
    • https://marljivo.hr/userfiles/file/3287034981.pdf
    • http://www.heksan.com.pl/file/tomugiwidex.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609840cdca0a6---65129670799.pdf
    • http://dentalclinicbangalore.com/uploads/gesejir.pdf
    • https://kitapkapla.com/upload/ckfinder/files/99967290945.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/99547884910.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d84e60a2d---fejamakovaru.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63f8b60440---4042263700.pdf
    • https://aviatroglo.fr/IMG/file/vulosapigogututa.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/jiniv.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/33cad9e6f5abdffe8a3ee4f9a894a4f4/20870133140.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/segumizirobonako.pdf
    • http://udmvdpo.ru/images/files/89874767977.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da4ea54f4---62701157011.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b91946372---newazam.pdf
    • http://raegcafe.com/uploads/files/5231969644.pdf
    • https://gonguyenkhoi.vn/upload/files/pabamisilapenubenabekexog.pdf
    • https://advantagelic.com/singhania/downloads/file/43331611123.pdf
    • https://circolodelpistone.ch/userfiles/file/kaxunet.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/13106e77dd8ca128967eadce5b2cee41/59881265638.pdf
    • 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_off0000e429.bin
ba0b29a76546808e1f3e380633d3e388f2d7696cb3df2e7edc4fc2f118c4e27e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 16856 bytes
font_01_sfnt_off00010f29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
font_02_sfnt_off00012740.bin
355ce0d9e0da626cfc4c8405593908426576b5b8fe6669ae1252622c826a6c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10540 bytes