Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad8ecf6440d0cbc…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 20:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4eb7d7c7fbd8e39b7f706c0387d5e8a7 SHA-1: 023011ab2efcadf3aab77853c92ef17049602101 SHA-256: 6ad8ecf6440d0cbce0f1c5ea28bf927d928be1754b9ff9b82c1588abcd772e8b
156 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. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://area34.info/wp-content/plugins/super-forms/uploads/php/files/du85beqvaioadq55mkk22qpv26/semegesirevub.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/17988445960.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd8d9319c42eea129465de4bb0539ff4/53459625631.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/59210802916.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qc0dsvf4eq3ijr8kf67tfro9t5/mutikoreponevemebuf.pdfIn PDF document text
    • http://techmechengineers.com/uploads/80741965515.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/beruvo.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/44630112202.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nolamusaluso.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082da560e456---9683593665.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/48183559314.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/25fbd98365bb8d068f46d3f6201c1588/sutedelalitikorimalil.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/34092374268.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5tik4csekguefuvve2uf3uv6uc/9886974235.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gp006hhc0p3udr9v0l3lvvpos6/63462655998.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/badob.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89ec7baf---dulebegowovifut.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160800a257734d---vetanamebukofifop.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/59318927574.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ab389a9c---xuzapi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1d8e2048---77451612848.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ac4338d---95554928282.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7812tnds3lbkjn3g7inm61l894/64806122694.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/faxovutefesejibusigi.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fewivobujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=corey+wayne+mastering+yourself+pdfPDF 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_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 11172 bytes
SHA-256: 2d58a7582b84239d5ba24acde09b30d5787ef69dba85c67ea5e25007058df769
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 19176 bytes
SHA-256: 6ed81100fe2aea58e4662d9a976fb8dddda6d6c4a2ff1fa9988492f53bbf6a97
font_02_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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