Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad31dfaf9538c67…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 11:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3058fbad7b1929671272ed6da5ef782 SHA-1: fcb19a26cb08c485e3d581bc9373c7373cd318ad SHA-256: 8ad31dfaf9538c6768ff2a36ec6a91b53e3723451893abee7307570854e6aa9e
104 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the document is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, likely for distributing further payloads or phishing. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to facilitate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://crewmak.ru/uplcv?utm_term=pdf+reader+voice+iphone PDF link annotation
    • http://casaatlantida.com/userfiles/file///denokuwatamek.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210828_E9B7DB3CD20DE1BC.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/59b5231a62efae425626219a751750fd/33028527891.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7888ffae---1146955701.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afdf17b23e---fonisufixorafejonumi.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/90305656447.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/54970e6486752b676dcfb0d11bc28782/wunimijixem.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2107292141587738107hft50.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v0dgrd4nkq5dqol9mh2mc074ue/turatu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/vimutafixipijudagowe.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/guwunukonaxumuzigizexati.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444aac9f3e---xigebuzisabukivugijote.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e559e97bd---mupapexuxazipives.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e56d75eeadb---defejesagarariw.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/filekujidawasotoka.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae21695d8e9---witigete.pdfIn PDF document text
    • http://headrepublic.pl/images/files/zubox.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081215595473499.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/visuludi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072acc691e25---notere.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jopixuxebewel.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xivunugidexisetaf.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/58621899092.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nobazojiteje.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 10472 bytes
SHA-256: ed8253b4577b681a8fcb68142cee98e406858c24967a009eec0b4ddc7c165cbb
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 18504 bytes
SHA-256: 46fe3511e8fcd8f25472ceef23389f21dfae8e06a277f2300e72fe637e62ad0a
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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