Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bf3520743c560…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 13:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac3c5730145a55b25b077b5cd11fe2cf SHA-1: edf235ebc747e20a9d80455dab263afcc56b17fc SHA-256: ca0bf3520743c56023d04d2d2c0c936ab2a24d9cf1f586934ada7a3636c9a3c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=god+name+list+in+tamil PDF link annotation
    • https://tp-pos.com/uploads/image/files/59943462026.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/jexojodosif.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/ruzugedolidot.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/genumufulenozazonugenave.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e6e0453c---norugekojirebib.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/guxabipiwexomefinorebiwas.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091110241380554.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/dogowawot.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nifikuboluziperup.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/34757020655.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e709bd3629---66685308574.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/ditezatepeniva.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q36kkl500jv748v34cfof71n76/gowuruti.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/6843303243.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/siruzim.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fm9481dven9ov9115p7lhfirgd/44220442899.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6a2afcbf72b10947bd8b3ac5b55b13c2/xetufuvugojeneratufumu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/dubovaveb.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/22206159254.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7ea41581---punubenoregekonimo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea3a507ed---pirimibolow.pdfIn PDF document text
    • 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10348 bytes
SHA-256: c20625d3b0f4baaad8d8dc8e3959de8fafd05893df5d73d9a3bf34c23352d9f9
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 18192 bytes
SHA-256: 7adbb1267983ecfb950c13c27f407add2f59aae71b91b583fe0ca4ac5308160a