Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793baf00a3c76f5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 11:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffd63205b1618267d9cca09255bfbdd8 SHA-1: cb6ba5ad247e4ab88ceae2eaa8e0d80a966b1f5d SHA-256: 8793baf00a3c76f5b5280f746359697c2c46e2c274137fb28adf18db11dd769f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of an IP address literal in a URI further indicates suspicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c156cf98dee---2089875918.pdf In PDF document text
    • http://techbico.vn/uploads/image/files/gijatukixele.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/pebufe.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/jncmg7fchjfim649nb8golher1/90190427994.pdfIn PDF document text
    • http://trivio.it/userfiles/files/87832110377.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nopatalujekomalenupulepif.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3nhjcp30l9p4lq86j9btacd76k/52166032355.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16080c01663bf6---kifidizanujawonizigezege.pdfPDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vtj0vu0jg9f7m18dd0kaspdgqs/teruvulakeki.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8mcecbaqpccrajcgq52tqhhkg9/kipumobovobak.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1091082188---59816302332.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/gesizifuwibifu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b166e7458282f35fea6c9b54a5a5ed59/8962453859.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7505066c1---fikitulofuzaz.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/34034510944.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2aced60c65402a14dae8b8b961878da9/41248639869.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jj1ubse2fd0fol37ltkocq3099/kipilikaduwejovami.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/72285796899.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4663ea037e3e2198e3eed6fbfb4dafc2/maravudenezelovuki.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/st4k3p6bq9arl535gmjsj0c8h0/pakuzem.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/42257699934.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947c4e375cc---juxikanimot.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/19403072292.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/morerelokifetaxabobiki.pdfIn PDF document text
    • http://methese.com/upload/files/naxuvamid.pdfIn PDF document text
    • https://manenshop.com/upload/files/34211826020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=netter%27s+concise+orthopaedic+anatomy+updated+edition+2e+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 17072 bytes
SHA-256: aee2bed66f4bf7a906fad9bdf9af53f64e218762986a22945d07595fb7f2928b
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 11184 bytes
SHA-256: 8110e1f0f5a6531296c32a4e8c26cc60fda5ae9d8217e44e538441787ae37905
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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