Malicious PDF — malware analysis report

Static analysis result for SHA-256 432602cd7c2d0e9d…

MALICIOUS

PDF

83.5 KB Created: 2021-08-08 13:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cd25e7e2afd899d74e6332c4c99dea35 SHA-1: 26cd02f36117eba773e9df11dbf55b6b5fd68248 SHA-256: 432602cd7c2d0e9d8d705ad4f83bfe928e808673f39433c723c6fea2dad340b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=exercice+multiple+et+diviseur+cm2 PDF link annotation
    • http://pol2-simf.ru/userfiles/file/gijelumalebojegixoba.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wipikosoluvabufes.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87vcdig8grg7bgmcld6cpaor21/12275649131.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/049848e1acb66cccbacc17e2ca44150a/mawojenuwefire.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xilalunafiletizel.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/14112055409.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e79eea363---datefinak.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/6m3dmp0tvtfsviav3kjv13e450/sorobupupefirulesafapu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8bb793bd649412f98ec267d3b6cf0ee2/lipuwonimaxowakunux.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4lqh987s28gcija32e5285ck3i/jefosigapagekimoka.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef80c0729---bedivavaritutu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sogogekekol.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b8ec5b04a1809425462908b4bca22479/31528398368.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a31adf21be7f74f15a087608fb55dbb9/woven.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/punatikasonebabaxu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/90024198392.pdfIn PDF document text
    • http://cascad-trans.ru/files/dixeg.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e13380c1852f673a039b65d94f8c317a/44762257876.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dbc154a002322fb73e3378eb0b8ae2b7/31223000466.pdfIn PDF document text
    • https://artbynela.com/uploads/file/96740604418.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 10660 bytes
SHA-256: 6107c314e856ffa444ea2208d043cfca6279c08ab53f260c37c8c3e0b46c8a25
font_02_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 18584 bytes
SHA-256: 2cc0007e3710d52636643301f86aa685293ab1b29165986bb12376acd383175b

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