Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa1be3ab4e988dd…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 23:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfda8d06351a6227eb5717def9499a71 SHA-1: 19619186d6d024feb965f7345dda5977edd50358 SHA-256: 8fa1be3ab4e988ddcdebf6a611e5dbcd8d3d200a96b8d2db20bb445b273d645d
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. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests the document is designed to redirect users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://infrive.ru/uplcv?utm_term=universal+declaration+of+human+rights+pdf+child+friendly+version PDF link annotation
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/kenijanapipuxelafetom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b9ed3e79cdc095a850b631b0c45eead6/koroma.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/14729972712.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d41d335aa---61920521859.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/44966206093.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607468a93a32c---62516996546.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/futinaliberuzibunobom.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/41898499457.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zakezoxeluw.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/88727383525.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071188194bb0---xerofuleviso.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/fuderer.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60e941c717816.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/21316155663.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094106996c70---58559692968.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e13f5970578cbc0700f0ff8602fff20b/3217657980.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f5tfcatleeeo3bf4k55vgjdbrn/48221300415.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m255shn5o77o6ua5iff8gdh45/18103042345.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080994e2debe---womenomisixizowagugovut.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c2f64ee02---84476663316.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/180456768460ce8d8ed468d.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/2009519782.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/52933013104.pdfIn PDF document text
    • 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 17412 bytes
SHA-256: b3fdf79a065224422ad9f8d81860e3d557e6bbca1f63da93f274cdbbf2c7ce67
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 15012 bytes
SHA-256: 59874cb96349ecd990db63db1d20a38cc85cc855fcad02de89ed318744382c6b
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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