Malicious PDF — malware analysis report

Static analysis result for SHA-256 54164f9b6121be36…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 21:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c14895a8fe56f7c9a583fa1ca9b04772 SHA-1: ae49b539c19bd2c1893c283dc4d04e32356379a1 SHA-256: 54164f9b6121be3634398ff2332a732e3821a1746046798cb9c1784bb2ff7914
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm likely used for SEO poisoning or to distribute further malicious content. The primary attack pattern involves tricking users into opening this PDF, which then redirects them to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a83dbed---86974985650.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/fupazugizizufidekirijoke.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/wodigubesedolip.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nawedilemomadigataza.pdfIn PDF document text
    • http://balalajka.nu/media/zademofoxunisapenijolevoj.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/90134157004.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/58798697180.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335da2159b5---75446148303.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/94381681079.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/7167256174.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908062912.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/87132955564.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3514437492.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/28325773238.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/jisajojatelelopogadu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gukibor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=unity+app+crashes+on+androidPDF 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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 10688 bytes
SHA-256: fef24f671153814e6cc5e07c3e2819b4b4b9374935a63629e232c1108b9bd8de
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 19112 bytes
SHA-256: 60ffe643a3ad6c60073070bf9eaeb4407f303e50f2a5cb3f2c474aaad23b1838
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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