Malicious PDF — malware analysis report

Static analysis result for SHA-256 113fa1f9a0a23d8b…

MALICIOUS

PDF

80.5 KB Created: 2021-10-14 00:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: de018b345348b803234d7c7e2ad3775e SHA-1: 57708bd8729caee6f424926e751b27796c1271ba SHA-256: 113fa1f9a0a23d8b227fcd8dd37a0580e4608b6e81b3a2c742af6f9eb9d93d80
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to lure users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.potravinyav21.cz/ckfinder/userfiles/files/4608443035.pdf In PDF document text
    • http://swapnakoodu.com/fck_uploads/file/rolugulorese.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/losavexedoritagif.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/79a82912a6909880fee29a0dd4a96541/tafivinunojunemanawujafa.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kogevejakekonomalewutasi.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/xirepimejixinaxi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/boribivibu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/nafatoninikebewaled.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/34438573.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/46858249476.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tnf68e815s02c920h7gbt874n2/muwunuxitalorene.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/251f3452d345f457420c907a1f34ddfa/gezav.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/61497221582.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zajoxomuzepobu.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/18557014695.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/77440949937.pdfIn PDF document text
    • http://canadianrockies.info/files/file/90523862106.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/75a12c7cb4e00049ba9c8192b1e6546b/58054461651.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/walajazatukoxesan.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/kuranetudepuzaze.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/lidib.pdfIn PDF document text
    • https://eslms.com/userfiles/file/lotobex.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/gufuvoxinup.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/gajalema.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=a+cell+in+hypertonic+solutionPDF 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10504 bytes
SHA-256: 6242efb6c38b066c5f63f6bc527e85afebe5c5c56f9e33326c06568bf6e6e2ea
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 17856 bytes
SHA-256: 020563b77159f623e92a1ba4ca102688ae90f4c5e52a7c09c9b5bb66a6743417
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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