Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ed9e89bc39ffcc…

MALICIOUS

PDF

84.2 KB Created: 2021-09-27 07:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 399ccb0b597566c5c935181a4bc4a76a SHA-1: 12753dd515ab23a85188a0379e220bc27c36dcab SHA-256: 54ed9e89bc39ffccf7595a5ad4e3e26e23949bd048d3da1304160d862163296b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=pathfinder+2e+player%27s+handbook+pdf PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bf6a562b6d4e58047d33fe827c43bd0/pavafudopatijivakegisuwe.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109152152466071.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/sajopanemaroxa.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631299602gubevusafuta.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf3e10536---xonupapewapifafagodinufot.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/79582824587.pdfIn PDF document text
    • https://uudanbury.life/files/file/sevasinuxomovejepexate.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/15988755082.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/jipitovo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbad53d17---girilomawatozijujino.pdfIn PDF document text
    • http://santabruna.cl/upload/file/8058296436.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66ac563c3---zizefeju.pdfIn PDF document text
    • http://yongqingtech.com/d/files/gobudadibaxefafiremabobig.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/33407507360.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/56553672475.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/nadatubatajogutig.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/35623117478.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fb4d512b---76750885908.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a0685606---rofifunosevuk.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/26279845584.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bijoga.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 21756 bytes
SHA-256: 9edb2d516338a03343d118308055dd1f4fe0b58ca6a5ba3bf27902aed47dd77c
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 11096 bytes
SHA-256: ce72b919bbc84e3175f4869056812470c98545f643318d3016a2aeffd8f8b5f3
font_02_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1