Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eca7a082e3b8b45…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 01:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2892f4f7baf32837f7547cba9ebc10fa SHA-1: 99a62f7aa63ffeeeba99920516b52c560cc88dab SHA-256: 3eca7a082e3b8b45187e7deb320461e21e8b3e617c062ed4f9fc0590a0d91c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://infrive.ru/uplcv?utm_term=ielts+writing+task+with+answers+pdf PDF link annotation
    • http://ateliergermain.club/sites/default/files/file/89106151190.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/nebajasunezot.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/rijokab.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/im5ki6tn0umn4kad6tm9o2deqj/10323580386.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479b451b7b---devuleluxep.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/dojinomi.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/66012850894.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1460277cf7a2911a8991807f79486f0e/kuranilibumukewisotiwol.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2ccf33bc22dc2d8551e2f8b8246c833f/26161699329.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4jms8ioe18k576sjsm2nf1nmt0/pudujowefefavetevu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/gumesixipan.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/tepajitugodaz.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/50088668878.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/fuzafesovo.pdfIn PDF document text
    • http://veitali.com/upload/files/3789163474.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/89464982705.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/rufofib.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kl4s3f3uusa574l46nblmd28j8/fupagefuxujogipukage.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6f89bfad925c9102f47e09e76ecfb1fd/65156141219.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/41710939511.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/gakegefulowafenan.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/34d0726c0f26400c5b6bf37342fb5b75/bilefewif.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/77410411651.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc2694945---bomesunos.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9aebae1c---35450847275.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17484 bytes
SHA-256: 6685dca4fc2888f7720e9c05ac630fadebe51418834eae7f5271d58ed2925482
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10788 bytes
SHA-256: 2fc282bd438076cdaf19ef23f10d5a2aa9c6a09339ab6c800a099a4d8c477c88

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