Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988008297dd00d3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 11:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5e8a68c4ff31392a33f002fefd0ca56 SHA-1: f73f99e2826b009411b25935886eb815b67972aa SHA-256: f988008297dd00d383f5811bcb3810f0293ff63b8568f3b7efd879d834b73b9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs and link farms suggest a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to the use of compromised infrastructure to host malicious content. No scripts were extracted, but the overall structure strongly suggests a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=the+world+order+henry+kissinger+pdf PDF link annotation
    • https://karpataljaturizmus.hu/upload/80066510752.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/felulufiwejewux.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/dutinigebunorugakaze.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656867629d---75376288135.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/gelopixexegoba.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kukif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee9eb58fd---nusuruwezo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/60153703044.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/28173150008.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b9542ca098ceabb25bc515e0f6713b99/66542661595.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/maviripasirobiw.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/9477787732.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/79331407523.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398d1228107---15097968812.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1fe2fdd224d52bbac94cf6df9d80787c/sizajufopimepek.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/82280319383.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/gosuzuke.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fujajereralo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/38062904406.pdfIn PDF document text
    • http://lovesenergy.com/file/28817842477.pdfIn PDF document text
    • https://vpmemorial.net/images/file/54629478141.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/7460655144.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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10772 bytes
SHA-256: 9b54e2fc0a9631313fd7395ad91355c6ba33465321d2ea0a36bf193325ca52a7
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 17836 bytes
SHA-256: d47b91a55ada3d5b368544391b628f4af8f669fd672da1bec2947de23d63bc62

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