Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec08a638ae47a688…

MALICIOUS

PDF

77.6 KB Created: 2021-10-13 01:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a7d3826811be98f746b7f662f5c1d49 SHA-1: 57ab8bf7dac97ecc7bddaa12b9a94fd35e4b88c4 SHA-256: ec08a638ae47a6888cdd65a3eb9bbb2ff16362f83ccda51bd63ac1a126ab662d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection, likely to a phishing site or a download host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8717

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.waetsukai.jp/system/ckfinder/userfiles/files/kisorivupugupabow.pdf In PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/guradidaxanesowine.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c1808f30---75414267473.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/36360451643.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/lipewekumakon.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0b31cbb9b9e8a40de736d0154b3e3c44/99417316382.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/detor.pdfIn PDF document text
    • http://thepvunamduong.com/media/ftp/file/98251005942.pdfIn PDF document text
    • http://espokebar.com/uploads/files/gedopir.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630894570.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xusug.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/29345830619.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c5ee17112a072e860471eca34642063a/12096018265.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kosiligamini.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/fotexojel.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wufajaxolekam.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/namogofawimoropesesefiw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac51cd18ad---malulonareraxopipiru.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/36585694800.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/39990781279.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/52473198978.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/57596081795.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/jopaxure.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/56082300142.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=1999+prowler+travel+trailer+owners+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10788 bytes
SHA-256: ba8ca31fd063a393dad6b8705cf43a386b6b1359930f1212f93f0451e0802c49
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17008 bytes
SHA-256: bf9be0c79ccf81d7b579f3268e20eb6f5715b485db21b910829b10fec30958f4