Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598db21f3f139f6…

MALICIOUS

PDF

81.1 KB Created: 2021-08-31 19:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e4ba4e9391b499d4de15fa9c71e9a5e SHA-1: baeb37377be470b84ffc0a14ebc2da1f66a44262 SHA-256: b598db21f3f139f657554db624fd2ef7336d1211671819b72e10cd0d6f989c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://webursitet.org/Files/file/39638684853.pdf In PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/xopaluzezumugi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097408b96434---39316154995.pdfIn PDF document text
    • http://stromzeleny.cz/file/42079830093.pdfIn PDF document text
    • http://www.bash.cl/media/file/70751706868.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dfe37bdaf27892677d09803547c85578/10493688804.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8895c33fadf0a8001037be9776122756/61389340479.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ge2qubgfg873chsusa8k41s9g6/guvinasuf.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865670c1c42---16718792550.pdfIn PDF document text
    • http://lse.hu/userfiles/file/19612419069.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/55132c6670f479e26d3a911a5ead9c84/96430546561.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/lorixova.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/neworikizereji.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/57632869110.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9845c768dde7a0d7119145a69eab4538/97704794108.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/sogulatamiwesugela.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zoraxepufu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nafevupuvarapajerakof.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/05a37573a2b78313ae2dc69b83b5c68d/16950698010.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/garogeruwapuzag.pdfIn PDF document text
    • http://mav-auto.ru/images/file/36177762287.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/48923812622.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/popumemizikukir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+solder+cast+ironPDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10608 bytes
SHA-256: b6ceae24148d90d748e17c7715ca5404d5ff1a47026bae230e0568827a0e993a
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17944 bytes
SHA-256: d525e504d47b3dcd525b78d56d4ee781509225a8d849adf34b139a7485aced3f
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.