Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca06fa917fbb6d63…

MALICIOUS

PDF

111.6 KB Created: 2021-06-29 09:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c4fd79d79d5b528ab2eecc11fc73be SHA-1: c6107ec344ea09b2f7b1e84b32c977e23ba64f4a SHA-256: ca06fa917fbb6d6360e87895f4b4f5cc7e6cf9963cb50dc7cfe3b2f40b9f301b
216 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure for browser extension or update installation, a common social-engineering tactic. It also contains multiple links to external resources, some pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=engineering+drawing+lecture+notes
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d2e7ba9c---86309086017.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429021816146197.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/9a35ad6d88e3daa55bbe2df85654f826/fevef.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a19308c---70976647348.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/gasubu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/000e1785c6b411d67ede25f45bfa77f8/puzidixafifojatipedekako.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5mvja46okk2dficear7v9p9454/91068263366.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2128a78f---68877359116.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089addcd26ec---bonedirafom.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdb81a35f---pogesifawaw.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095405f0a48d---77489341378.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1932f58309---88976703669.pdf
    • http://kasargod.net/uploads/file/59061158358.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4b389eae52da17095358a229c6e38a99/74706304403.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87419580768.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746e14990---71133404714.pdf
    • http://villapellegrino.it/userfiles/files/pazoxebeni.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rf6v6do76rnvc55qa36bgsjmt7/74796707372.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b9d9ae6a---bilud.pdf
    • http://fixafilm.se/userfiles/file/57328889708.pdf
    • http://coffee33.ru/archive/file/xiwig.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/beb62533a868cd6f7ecd35b7912f04bd/87095516762.pdf
    • http://www.jindatunnel.com/up_files/file/52822800218.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d8bf04bcca177918c60fba1c492eef74/24229468141.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/415d969d442f12c541c706d7a9ae8056/55617672698.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/q31b9nkkrt4nri7vmqqtgt9epd/64258286655.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16792 bytes
font_01_sfnt_off000150f7.bin
f816b487668fa25e4d3a88510f99db9d4de2601d96dd5564fdb3f62892234f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150F7 17908 bytes
font_02_sfnt_off00018064.bin
d9653e310a1cd0bfeccdd7e2e6d1b5051cce6f9f91890493d77efeceb36061c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18064 10712 bytes
font_03_sfnt_off000198f2.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198F2 16244 bytes

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