Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d21862ca47815…

MALICIOUS

PDF

62.6 KB Created: 2021-06-21 01:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad27d6bbaf91698abed42e8ea6351a5b SHA-1: 856e9e3a99ed2b2503278b66034e440bb4309d92 SHA-256: 231d21862ca4781578ace4d561ba50e9e05d799d15952c06e0c56d35ab55d9b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate further compromise or credential theft. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://clinicaveterinariailmarzocco.it/userfiles/files/28440771054.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2qub22oogs2lkts0mlrp38bkqp/47465454369.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/13909822544.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4f71f3c8---sirevomulipokoremodalap.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cdda32ad5d6c88f3288d8f0949aa3f07/29131970762.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1gnmusm9g731pimje18j7fvvrt/kakasonofubefelete.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/10005917739.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2be4d8c18ef79bb63d045541d02737eb/lodijepemu.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nibelekexazovojiremubemu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac831e0d335---vezamur.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/30604637393.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qm06abkdukpmv8gh2qk667v456/budotufasibojupiv.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/8155669017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=instagram+like+generator+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95B 5140 bytes
SHA-256: 541eccda34ba792d52a627c27420369cd7440ab767143737d00483800e4cbb6a
font_01_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 10188 bytes
SHA-256: 700297e0360ac6cfe8f7e0eb16ed86acce84fb7249cd2817d843627a0376df11

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