Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd96a777a65750…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 00:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e31f029ad655629f23966725ccb3e1c2 SHA-1: 051861a4b1de8c429260ae093105fe80be7a7fdb SHA-256: 19fd96a777a6575085f83994d1dfeda564ed6a4ba51bd059496cc78aec335194
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://devveb.net/userfiles/file/burexopokefipepawajeba.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/vivusaboketopopofemifo.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/foziriwa.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/korolusagavuto.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kodex.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d2dd6447---nibisaxetafu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614028121afac---84795665482.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/27276897714.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/rejekuwum.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/pegutivegesedob.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/48371885121.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/18001878530.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf3d348ab---45458272960.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j304buhthkfpvmcnavmpb0jeo6/60393861550.pdfIn PDF document text
    • http://effekt-film.de/files/file/wabolaz.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/2026043158.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vunowipogaf.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/83137202630.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kikutan.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/risawozasoxafani.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/50965673011.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/jupidivovixazabegiwomevaw.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613088e748225---71306536463.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/43236986683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pro+evolution+apkPDF 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_off0000b87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87E 10336 bytes
SHA-256: 6c0898c5d27d3acb09de4779c18cedb886457f77879b56210d94ff1f88125ab0
font_01_sfnt_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 16360 bytes
SHA-256: dae9afe966119e8efef10be5115c99b926a71a4df1334ab4fa36cf5d2e26466f
font_02_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1