Malicious PDF — malware analysis report

Static analysis result for SHA-256 03899883b65218e1…

MALICIOUS

PDF

105.6 KB Created: 2021-09-02 10:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db0ef8a31bfdc771f1f2f3d67a298ea7 SHA-1: bf738ef5d3d10a70b3b5b982c4ab54d0046ff782 SHA-256: 03899883b65218e109a901947dc863540e7752c133bcb8e17faf615ccdc0ded1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://au-coeur-du-temps.com/userfiles/file/73185392860.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/maroziloronizitakotowewup.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/7560159749.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/74450379634.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sajakago.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a17e4d7c44ee8f7c02371f5dc229a44a/dutorozov.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/65995668599.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/u32qjbafgde29i45chs6jpklg7/jajuxozusebixix.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3834472e---lixebitidinej.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/ferufezezamukusoginevuben.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/82964831700.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105c41a697d0---sumapekojurikofu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/76346684814.pdfIn PDF document text
    • http://hrudolf.com/userfiles/36344178594.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/86212712236.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/tibidofutukub.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f9c965c---6660088067.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd35e85f21---bopodujokafofotovopo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a487e703---69446373034.pdfIn PDF document text
    • http://farashimirooz.com/files/bubuxujefigizorulevilotu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pofininubaxotudavuzivetuk.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/46328091732.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b940c09b---waxag.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/22703461962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pathfinder+gods+by+alignmentPDF 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_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 17748 bytes
SHA-256: 270575f0ac99be2b4ddbdb7f715278ab46da894a296bc710f9b07e9747a73e3a
font_01_sfnt_off000165dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DC 11056 bytes
SHA-256: b3899f0b81252c22a5c57b7c922958b9271605ba691ca71d3ab2c227d246a393
font_02_sfnt_off00017f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1