Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd426a97021a96e8…

MALICIOUS

PDF

97.0 KB Created: 2021-08-08 01:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 048e199cd993cd58f18195689c64daec SHA-1: 5244eef65e3848843fee8f8aad7053e53e3becaa SHA-256: bd426a97021a96e882f2cd92e2cd9f884b9fc3b95b443373a994f05222506ba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised content management systems or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://cructi.ru/uplcv?utm_term=what+is+the+sequence+of+all+marvel+movies PDF link annotation
    • http://msslink.ru/userfiles/files/modufetamapotamojoruze.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e523921a63f---53030784651.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/xebasunosonazefon.pdfIn PDF document text
    • https://avflash.nl/upload/files/lapekidikaz.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6750d80d---xofubojafalo.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/77744306727.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d88dbf34---80379565425.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/rulonunowexidigovunixa.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/36944871610.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qookgggh5vsoere2ki4k1co170/negopas.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/33220075051.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/nivedev.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/26091094491.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/58465650880.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/valadisasatitebifuwup.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3d00e2da7---93227684911.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/dokugofagogufupepil.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/43294931536.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c8721661---sevikagetejimak.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece8747846---84304195100.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb408bebb7---94917245118.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_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 18312 bytes
SHA-256: 7b6571dc81b1c6499e74fcbda23e0d854f20496fa0fb18af41a7b5b6d6e29774
font_02_sfnt_off00015d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D16 10904 bytes
SHA-256: b4e951834dece783cbf6dc2d3c67612c7433373cd50f94923f168df6179da2e6