Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad97431561ea1d6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 571a2efc81a8eb36c752a6422a651830 SHA-1: 5fa52045fd8323c1876367b1713cbd143f3e1047 SHA-256: dad97431561ea1d6d6ba5e7f0cf908b14c1fa0f92dfa7ded717c39ac6cf9b4d0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=top+5+mobile+brands+in+pakistan+2020 PDF link annotation
    • https://www.truck-transport.com/ckfinder/userfiles/files/tezoreg.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/13674971301.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/19068662608.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/goborivamupagimasonixes.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9e0ef22c09fd806d9c0dc6c03adea9ff/kegegixunef.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/titudejija.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/zutatesasatavireto.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/wajetatirijivavepuvopovex.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/55941393702.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8e05d17317498cd7f924cfd81455ab79/74047149253.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/86146566436.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/30371109150.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/datevamebegejejutef.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/bipajirenoradof.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5cbbafb6---26882778758.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/40678116765.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/nuxakagesuweni.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/famugukamipowulati.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zaxazetaxuf.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22049736703.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/96329244711.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jirono.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17780 bytes
SHA-256: 86c56c35ed62e2f77c5b69f00179d744e315c1a4dad58b0d7d5c6ad8bddd36cb
font_02_sfnt_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 11124 bytes
SHA-256: 837f3c6949c28430aa5fd1686e621e6ba9719637016c24c3d914a864902e908c