Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8dfa89fbca4cb0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 16:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f98245f1dcd5cb838e555ded50e4f693 SHA-1: a53587a98fdfac515b32a8468c5b3af642407d08 SHA-256: 9a8dfa89fbca4cb0c4a78e131598435ffeba9e655109e3cf7cc38b93f2557495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics suggests an intent to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://institut-arabe.org/ckfinder/userfiles/files/74679645810.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/9694859059.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/22949342366.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/juturusesefiwa.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jufufa.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nobigigive.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/374924252.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8200a98e92aeb8023c97fef52a5e9a8d/68551080297.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/ligomajomofabowenebonu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/gemaxo.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109111915262590.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/78059314780.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/fulerodubijobiwujaxibow.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/91002296234.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ebd7fca8---rasewowam.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f454c77c4---70066695860.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/fuxoni.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kuladiloxipedonirevo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/96003685384.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba5c6d04e---tipezarowuworusa.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/51867831368.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jebomevisifivapovesogatu.pdfIn PDF document text
    • http://cpviettin.com/upload/files/63886280572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+android+games+for+androidPDF 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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 17632 bytes
SHA-256: 24a7a5d0c3f4e81157458a2d8c4e0644adebc47cb79971141831b8c0e4d7cb23
font_02_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10704 bytes
SHA-256: f0bda8c42aff37f95a8af91b4bd5d7a37f7c11775ac10821d0acb0e5f397e6c4