Malicious PDF — malware analysis report

Static analysis result for SHA-256 986f3b0e0322d74e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 03:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5eb7c2e6593ba65e71cd597eae4bea5 SHA-1: bc43c2b7d8b03187bb780aba008af2d2dc5c9a3b SHA-256: 986f3b0e0322d74e689cc84ecd0ba9703850b412dcaf3406b24265dfab41e35f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a common technique for delivering malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://naso10.com/userData/board/file/befezu.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/8570858545.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/gevaj.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624016362tijaxol.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pepnqkftgk60a375r7c963iu30/rejegonesorofupofaxeregos.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19499114966.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68d4136080---98661582293.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/91120423990.pdfIn PDF document text
    • http://candientushinko.com/images/file/vaviwavajuzukewajiti.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/27785531661.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1594a94b---saranunetubekejitolaka.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/19820101842.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f516601baa---fobupuxodiwejuvowa.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nozobi.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/dotoba.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/jujuligaxasitap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e63f6851b---zutusepil.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292e9fc316a---fuvinopetokububasax.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/19820133492.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/28069385937.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/takatusaguxepexivus.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///kalelijirusimuwer.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/25606079284.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/33775878293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+everything+music+theory+book+pdf+downloadPDF 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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 18176 bytes
SHA-256: 9b63145dedaeb3ae1a5a43eba640bdb8a2b07e975989139e47f47fb952e72b36
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 11628 bytes
SHA-256: 483ae400462a3f51fa64cb778306c59f19a88b354fe8251fc1f619573cc622b9
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.