Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb39691428a2bd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 07:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62f32861ad712229c2a7104ffddc27cc SHA-1: 25ae0c8e73ed1a0c5844b27f701f747765983859 SHA-256: cadb39691428a2bd811fcfb58979ebaff8ca6026bf7b2ad231a2092ec7a1c034
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The ML classifier strongly indicates malicious intent, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=how+to+hide+a+app+in+redmi+note+8 PDF link annotation
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/fuxebajarosife.pdfIn PDF document text
    • http://skomi.ru/img/files/file/63483931731.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nijulikuzubikerexowo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/xememulajukag.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jemironowejetetepij.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/37686803958.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/19892566227.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/widoxowisaxe.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/savovunepawemiwekarepino.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ihe058esftfq9u15l7pvr8qj65/jabejiroruvuzokiwi.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/5287711699.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/68550665573.pdfIn PDF document text
    • https://media-get.com/userfiles/files/luvutusilopafupete.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/lerevifufenuditur.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/de352b4f8f7a7b7bf7fe97f9c64dd107/sekozesusimefu.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/48866317453.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_075033.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/mekenugaxamejiwa.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933511cb93---dizunedewasasadizokebib.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/vidozula.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2e1a0c9c---39131878012.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/xigewus.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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 10728 bytes
SHA-256: d453bc1cddbabc841835d8c9a9a3c6974f2bb46121400d52bdb0d1ee17694f96
font_01_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 18012 bytes
SHA-256: 598db77f9a7e3b15d4407fe64d3924bb6c534925ce353315411e8757d9a7c88d
font_02_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1