Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea732b23b46bbf1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 07:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d9940839ae69dfbc03a5ab355e0d724 SHA-1: f10b3ac8240b65e6ef67c6a38ce9c7487bf74539 SHA-256: 0ea732b23b46bbf1c029dd0555c3ad57288eeb55ca63dd349fa6fcb0bd92c315
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://clinicaveterinariagussago.com/userfiles/files/97331917405.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f5a1ada4af90312730d534290fbb8214/63551585677.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/11379166841.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pezuzemonubujajeses.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/13638266679.pdfIn PDF document text
    • https://renetravel.ro/images/files/15532276117.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/wowotirekerokalenidunolim.pdfIn PDF document text
    • http://pedraferro.com/files/files/24224406024.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/75c7b4ecd71852fbb6448cdb191eca33/34970405847.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210716155554_ei18k8.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/2554845820.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/jopowuxejopan.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/9068215349.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/06253300448d58db77e04c8fde226e17/tudukezarusegarib.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88539030659.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cfa930b33---43955779452.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rabagex.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e304569a---90719825548.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tuguluzuzusike.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/27380626210.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/59b04a712b238bb07cce9a9ebe3bbd72/kedebev.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sapinebibosomumafodoz.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/teripoxulusozogozulilugof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=save+one+worksheet+from+excel+workbook+as+pdf+vbaPDF 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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 18624 bytes
SHA-256: 9d28bcf2fba2ca9a3b58ce49fc7b96c317598cf8f28e02834554d004d4fc3003
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 11356 bytes
SHA-256: 7deef2a8d1d79db04ab527ce5077842f6af95e3901c53012a1dc08ed83960280