Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436f8f391d0bb52…

MALICIOUS

PDF

62.5 KB Created: 2021-06-19 12:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 645d1278d4e2b7015a43d67e0924f6fd SHA-1: df2fe47bfc52bfcf86314cdea2371e881fdb2a82 SHA-256: 2436f8f391d0bb52ef06525aee5a9dc0fbfbcb8277ae1d10883021e9904d2620
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04a706d0771e8defd8465f88ec530daf/mirumadikijuropiludes.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607964aee1010---59163447138.pdf
    • http://newo.ru/files/files/62885036537.pdf
    • http://ccspatti.org/userfiles/file/dojulovitarekepelo.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/7dcfrmskn5bifu43b7vv5t4rjl/65575173996.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/nigakumobudewejisax.pdf
    • http://fitviewer.biz/files/file/83638118278.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210531015101.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d5c72543---samuwezesivimofen.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8af9a5e71d---junuravoxujadejavikizok.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/252a6e02973102f5189eb22c5847e40e/85069419754.pdf
    • http://texmet.pl/userimages/file/somivakiduzu.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f28c5df4---zejuvisaguvox.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863a72799fd---17111569564.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d7f86fd6757ff6e0d2437036b3a9ba7f/87013644004.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vpmp169a9k1frim307cuncc3gu/xunanekazazoravomafiwurel.pdf
    • http://brmhn.com/userfiles/file/20210521134334_0xf6rg.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/166fc57bca85d538a9e6f985fffef22e/nimugulozepapatevabudifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=good+evening+dracula+gif
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6e.bin
4e69d4d9ccbc0413d5cc20adff484135fe85ba72d6cd5d30a2daca29b1816af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 5104 bytes
font_01_sfnt_off0000cbe9.bin
bad0274f0f7bc13bf2d37745751b676f263f5645b48d94637880b5ee46f5608c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 9732 bytes

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