Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e888eb93632f5aa…

MALICIOUS

PDF

123.2 KB Created: 2021-09-12 11:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 019a5896fdf06820979b8d93d09d3964 SHA-1: c84f28519a413816efcaeaa7d3821e06e1949a05 SHA-256: 9e888eb93632f5aaac221bf8b0b06c02082b309dc59c831c412584e3df6990c6
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0afdedaf618d2d3e046fd58effd83922/13033395167.pdf In PDF document text
    • https://huaienclinic.com/uploadpic/files/puxotanagukuwuwomukob.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/gasev.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/judosajarixemabubisenoj.pdfIn PDF document text
    • http://web5gstore.com/Files/files/2947598247.pdfIn PDF document text
    • http://webbuilders.com/files/file/26197024367.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdfIn PDF document text
    • https://777mto.info/contents/files/71701584264.pdfIn PDF document text
    • http://recviem.ru/img/upload/dezovi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8470917---tarusobel.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903013208.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c67e140---bowosokojebip.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/rexijoxefixi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vudurotuganitot.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lorukokijiwadusasuforir.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xegepulavozamil.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/67056090837.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/60645236025.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/tugopoki.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d2faa836bfd21176091246c38b48c28/kogixexunamibakawinebom.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/48340481042.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/8084946837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=why+nations+fail+chapter+8+summaryPDF 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_off0001763e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763E 21696 bytes
SHA-256: cc9712ab25ef7ad54220921c0112693cf9b184ee18a2f20b0bcded2ec9580e61
font_01_sfnt_off0001ad33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C54A 11160 bytes
SHA-256: b143a2dd23aea41f8cb334f93264997f4d73f93276181d5bf6d8cc2100e693ee