Malicious PDF — malware analysis report

Static analysis result for SHA-256 057db563825885e6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 05:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e66d9ca4f68c2afad7cf46bdafdf3f3 SHA-1: e66127bd70a4841ee1d939319b457a5e3f663e2d SHA-256: 057db563825885e640f18a86bbf43b79a4f929b519b5b079a7f141aab5e19dae
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=enable+google+voice+on+android
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bd5cf1a67---89232397484.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff2c96fd03---20327850108.pdf
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/55171769825.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26aeab68---11279124091.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/67ce55d36bqh7unuh8ab1dastt/kigamo.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1fb8ef8d6998b7ea419d6370a142f687/48722928710.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/gelasa.pdf
    • http://gowowdeli.com/uploads/files/63093121870.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/tunuxiwelokewamepegijopuk.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sikowuwiwepolarizabulub.pdf
    • http://nj-rshb.com/v15/Upload/file/2021919132494676.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8f3da54c---fizened.pdf
    • http://dachastyle.com/userfiles/file/vajulovo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161527511f292e---jexovemogezofidet.pdf
    • http://pdww.ru/ckfinder/userfiles/files/rezije.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/30308596985.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/60515167627.pdf
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/xebubevolipababinirebiron.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cbf967cdc---59377968668.pdf
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/mewigun.pdf
    • https://nonbodepsg.com/uploads/files/50001681667.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/64129169522.pdf
    • http://kondicionery-pushkino.ru/upload_picture/file/11417398212.pdf
    • http://lakesnwoodskerala.com/uploads/file/kugavefenaz.pdf
    • http://makassitools.com/userfiles/file///tisulabipapuwamam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b596.bin
05830c35060ecb525d00cddb09ae126934452b14386f3ca448eec922358e39da
pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 18692 bytes
font_01_sfnt_off0000e54e.bin
c9e68dceac3745658a796f6eee61bf788f475707d24f3cc64dd8d676ff00c299
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10468 bytes
font_02_sfnt_off0000fcef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes