Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81927db3009cc84…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 12:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1854e2c07ea48cfa616fc3d61b74afc3 SHA-1: c9ff441147b8bfc76cc1bb0b9f76aeae89d361d6 SHA-256: d81927db3009cc84f25b5629c95e032508d5f40b5c71a0bf2fbd243a9d1baabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to various compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to distribute malicious files disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608616af6837a---66035776095.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1v4ug2444tnd8oag7kfoehu0j5/xitosunodogogexagewux.pdfIn PDF document text
    • http://liyangah.com/Upload/file/kuwutojaz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f6706872---giraku.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04a9bd6885---24227693158.pdfIn PDF document text
    • https://maisonforville.be/documents/file/53933647135.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/48119828028.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081427050041---mogowiluvikev.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/81296052053.pdfIn PDF document text
    • http://wawa757.com/uploads/files/fasasav.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/15322949201.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14451256030.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c9nou1a3jkrj80mn1bvr72qe37/86184731745.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7kdpemip6kcbk1lj121njdfbk3/dezamapozil.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/dumategozilebodo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93215227839.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c3b29d91ea3f1dd62105d2658e44d4e/buborevatawigijonorinerir.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/57213224032.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/xokezosikudivuvis.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321512133.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ffce50241d1da25b5c18bc5e7c4d925c/97892690071.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b617818390---43122198659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=quickbooks+2018+pdf+repair+toolPDF 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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16400 bytes
SHA-256: 3127f19ba753ecb26c1ff51b3b12add6fe78dd57405c4b998e98ed6741e45be5
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 11404 bytes
SHA-256: 70555f5c93332e1bad72e48edb5d324c5f5598fc55979dc6b4a32b489b8b5505

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