Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7d2ba1cc2210a…

MALICIOUS

PDF

105.0 KB Created: 2021-08-12 03:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c15fb653fd4be4f7336cb0c3491d52ca SHA-1: f59933b40ec54991a5f8c497e524ed82d4ee3f95 SHA-256: 84c7d2ba1cc2210ae7d8d0cd1c82bfbf1b4fc93fc5535d3e1b0e7251369d3de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c09b4404---87527948903.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/7474360426.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e0e2c486---37926893085.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u5qgdtjdm3n4qmburu9fktpt71/23467562181.pdf
    • https://12shio4.com/contents//files/bolomej.pdf
    • http://kahounova.cz/userfiles/file/81037954068.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210804111144404689ls61bn.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10006e6d76---81989232001.pdf
    • http://accessiblevehicleservices.com/userfiles/file/37684813816.pdf
    • http://pwr-tech.ru/userfiles/file/ribowaf.pdf
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/84437918613.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/88cb30fa8f75f76ca06a86219cf57f49/41778930279.pdf
    • https://plentis.eu/ckfinder/userfiles/files/bipowegimifasiboparusovir.pdf
    • http://www.lircai.com/web/inline/file/podar.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q7ub73qko9fg8ng8gi0scscet8/vipunuwomibememotarapegu.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78696d5027---livibepewudikij.pdf
    • http://ldbell1965.net/clients/85689/File/44797300571.pdf
    • http://timebymtm.com/upload/files/sodijaluxiweli.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/mepumojuniwev.pdf
    • http://asustainable.com/global/file/80412534070.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/tuzune.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cessna+421+engine+specs
    • 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_off000136f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
font_01_sfnt_off00014f0e.bin
2e5f047f2c5bdca68e4e9b641c64f692b9039ef0b7ec74b34dc8b86e463a1ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0E 10468 bytes
font_02_sfnt_off00016719.bin
c29770cd5bc435b7721b5122fd420490922f1b33df8163749ad343eecc703f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x16719 18028 bytes