Malicious PDF — malware analysis report

Static analysis result for SHA-256 035b715fc1afc31b…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ac29d8a48e198badb12a3a177b7f99d SHA-1: 73f1ddeaf51c09e745095b2d893a8504d5601163 SHA-256: 035b715fc1afc31b0b7a9bfa1d2e77a314fff9f46cdb535950d44c35cd408ebf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onlineadda.net/ckfinder/userfiles/files/diladarudakon.pdf In PDF document text
    • https://maintogelonline2.com/contents/files/nuwixufiminetoxazoradobe.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/vuguxepewisov.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/jaxerozi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/125027a0337e5d05d7979bed6dfbe06f/lelulovajezepezej.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tolofogewuzizadutawoje.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/susixedoxufaje.pdfIn PDF document text
    • https://kiptep.ru/file/83577717279.pdfIn PDF document text
    • https://codecs.ro/images/file/96270174693.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/99314427730.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/zolatibi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/16417726201.pdfIn PDF document text
    • http://ktcz.eu/files/files/firesaritokiliboso.pdfIn PDF document text
    • http://dentherapia.hu/files/file/16155507840.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/vukuwerut.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/50034221352.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/1978649158.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/jenaraguxivojenupoxusuxu.pdfIn PDF document text
    • https://jss-moms.si/upload/File/91131785262.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/mosoxitujeti.pdfIn PDF document text
    • http://space-edge.com/upload/files/sipigenudaworewepovobow.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ov8h9ci94s1u51fs8n40a5ff25/wosufeg.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3fbd7f48f0bfed8329ca5bb9944a3232/7640125758.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/watexekelu.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/fafil.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xoferi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=first+law+of+newton+equationPDF 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_off0000d2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C6 19036 bytes
SHA-256: c331f6dd18242b81291002efb41285ba85a74e3e9677d733fac644da0f508bb9
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 10516 bytes
SHA-256: 28b7e165240776fcea191cf1c31d81a1c32314a121b45db66ddbd19ead11fba1
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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