Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f04f84f7c1aa1db…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 06:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2dc57b8309cbd06fb2fb078e00140120 SHA-1: e67b4f66e10fa884455caeba78b6d14a97e99060 SHA-256: 2f04f84f7c1aa1db79b15c2ffdba4fd6594b192e71750cb46c0748339d89aab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://xlspandoek.nl/userfiles/file/33512405500.pdf In PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kiwisuludap.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/88f7eb4bnun5k4i84r7dt6i5i5/49025441429.pdfIn PDF document text
    • http://pedraferro.com/files/files/povinojeloneg.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/10569520753.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030416176912.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vibitosel.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3516c5f5d1---55430332027.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/rulajetizejurew.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/tawinemogukivejur.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872c3f4ae7e---14872674415.pdfIn PDF document text
    • http://954move.com/clients/4890/File/61661623164.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1d187b89936b173b38d4d767efbac434/39637806400.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/dudibumejudululimi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40b79710f2e1f345476ffdc93fce16fe/28682930750.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/baxekikopumejipagiwuzir.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/90320497508.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a59c3ceab02f40b292b64780224588e0/fuwoteridare.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4392b59f8---fasorusewaderefipobu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6463ebd2cf---diloletaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=long+division+worksheets+with+gridPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dc48eaf4fe5d448f88e0edb6742be037/xiwokuzedezuto.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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 17048 bytes
SHA-256: 8e66948134b74c1a7c03957321d4d3ef134de2e401bae070558ae96ab74b8203
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10520 bytes
SHA-256: ecf694715ff2e77b9cacefe5335f1a929fb64d9efcf4f2bbdc307946b011e134
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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