Malicious PDF — malware analysis report

Static analysis result for SHA-256 4634fff5a092bf34…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 17:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d394e5edc2354cb3a6ddea1f336c9e6d SHA-1: 1793b5417c1ff618f0c8240e5a52c6e722c1ab3e SHA-256: 4634fff5a092bf347b0bc647c1a8a552d64cdb46b67a480adadc3d069a3e7382
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/vonajowabulapepaj.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kikopope.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b0a4c8a34---11303764976.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cf8a50df---zebomuka.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b353c345107---27659702810.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/89341192210.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6bd78017b---23939651684.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d1079af2ed3cf6515eef6c308747df9b/72863073182.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1dfed69e---59059577942.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce91d58d08---vixalapimitilorerobisofuw.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/85327636961.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40ee00334---26827200195.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/supepukegotejewafawivix.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2613dff49---rasidiweli.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fooj8uacskb78uaujr4f696gj/bubifosu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802349507d7---24263429380.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/17661802803.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/26336583273.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/ronanakubapijelewox.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16090e45e5d985---vibubu.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/76686097355.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/cf0e0eba6bc2678f087b9db595f7d13b/fizuzukikawiru.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/bowufanin.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/bumozekabumikamabaxoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=if+one+of+the+metal+is+mercury+then+the+alloy+is+known+asPDF 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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 10944 bytes
SHA-256: d318f96d3900f9b46065e2c494a1519a606b8358902535ab6109446c07441221
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16768 bytes
SHA-256: 5dbad1da7dcf2ea719775ca93ee20affe6f1e93d111f893282152f1bb9e8c70d