Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d969516bd95990…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adb46b14d35304ed3e9b3755bfe521d8 SHA-1: 45d6698fb83391061bc0986c85d0072e6d3d2612 SHA-256: 96d969516bd959906ff9bc451b9ebf209df5d71d18f8af233c3de6169a691c1a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studiotecnicolari.it/userfiles/files/61883155537.pdf In PDF document text
    • http://om-ar.com/userfiles/file/wujatenew.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/tisexegozedifux.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/76030786103.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/mupanekesawewiz.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/wumijezotuwego.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/25/file/jetiraxotavam.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/58403871799.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/toruvibod.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bepivuwitirosawolub.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/29893486110.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614698f328fe7---nerorerofu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/70211917466.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e7ff0617---311953558.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa61e5990---11372999867.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/3231672211.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/xilajegedomiko.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jukeranipepe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9d68d72---saradugakanosifonulogadud.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/87393273262.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/fadololixuxoxovolabogiga.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/wilofasobemega.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/lekuxanomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bible+bangla+pdf+bookPDF 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_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 10592 bytes
SHA-256: df88c723920b46ba20cb77017a173a9c1224f4a6cfca67516a055fa8b9abab28
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 17980 bytes
SHA-256: be2d6e2d9e8f64bde97341d20acafe36bb2984136bb4256f2bb945080d1ca01d

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