Malicious PDF — malware analysis report

Static analysis result for SHA-256 8590abfc6e1f9acc…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 14:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30b293c93027a79f118e83161a5580d0 SHA-1: b60fb9bb8f5a6fb9d8935f6a77b118ee1c903d86 SHA-256: 8590abfc6e1f9acc7ba899630b69f07ede4a7885cf5768713cb30a17db017d2f
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or link farm strategy. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=homesnap+for+android PDF link annotation
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/44639599274.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/nedajeziv.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/20781689544.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/guvibukedowirepobixapeb.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210919085216630.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/tuliganux.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/mekuzige.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/latagubob.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/makukekumirux.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/66175180504.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/paronasaneviw.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/65755922743.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/sudesinuguge.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/11ce6aac679a206a20c10f20f3563fa5/butam.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50907777979.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/96278173549.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/ponogaduvopiluvuzijovudag.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/51707403077.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/nafuwonoru.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145286950aba---75408620128.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/39600289771.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161375a78167a5---degemog.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mivobinatulenulawemaziro.pdfIn PDF document text
    • 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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 16248 bytes
SHA-256: 85d2a8b8492b05bf54111ec3848920ffa01c0dabdd77cc0d4fe72baa2ce81d12
font_01_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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