Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc655b2d5f0c1257…

MALICIOUS

PDF

79.2 KB Created: 2021-06-18 11:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3aaaf26263328e38fd8208af12d48613 SHA-1: d3d26e9cc7fa34a689232cebca129268110624d5 SHA-256: fc655b2d5f0c1257afb77d54d24966c284d208d09890402483662f589d1cd1ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which host other PDF files. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that some of these links point to compromised WordPress upload storage, suggesting a distribution mechanism for further malicious content. The overall purpose appears to be directing users to potentially malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zold-kommando.hu/files/8817752997.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021661315489062.pdfIn PDF document text
    • https://webmenuplus.com/images/file/sajuzod.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4a27f59d509f6419927c7b005328a657/29527102776.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8046edd73a---fepedijimuxudivabas.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cd772e41cf65c809975db5f300dcb8ee/jufafimu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c195f98f52d---13015061796.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/juzate.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe319bb4a---mazinoborijurimobivezir.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde3c7b26c---jetodamavovojukemeliruja.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/008ba598cf899722a8b0a800832a9fa5/76864204509.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/giwidiposibatotiwowi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/849323949d33ebc25f479700e996729f/94034083160.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/29e9561a823f1fda7b708d9daa33cc01/35474980795.pdfIn PDF document text
    • https://activepymes.com/pub/file/17438514144.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c0333c45---31319409804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hdmp4mania+hollywood+movie+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5228 bytes
SHA-256: 0ec5d7aee5a9feb51ed67f74c6b344ef0a783e25a7a94a378526883cba31939b
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11728 bytes
SHA-256: 8ef8ed7ebf44783c20509abb8b9a4c1915f9622cdcad6162a6fdff951ca4b853