Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b74dc30603a648e…

MALICIOUS

PDF

76.5 KB Created: 2021-06-04 07:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103311045735c2b8979ca424c0660aeb SHA-1: 0b83792126c77664dfdc32cf178b41864a5e8d94 SHA-256: 4b74dc30603a648e6fb93971db9fb494c5dd71e2c03ac03d1c9dfaebc5795fbf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing attempt disguised as a study guide. It utilizes a link farm hosted on compromised WordPress sites to distribute the malicious PDF. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a0b31a22---konux.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c02420a6f849a21c1b6c44979192ffa0/jojedajizizasirukinuxasum.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce3465cf5---24898824949.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e452e7d544---salubi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/840f5169283e8e50c981b44513fc0b8a/jojawurise.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/53087154851.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a0ee8e4a13---47913937354.pdf
    • http://travelshops.pl/userfiles/file/podemilagalugokutivino.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/706c742d1ac582511b88984108bca485/19437640677.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2b5acc8bd9441b704b937d4277e47482/27625088101.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e9c474bb---45464885585.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/41ae2e18eac8fbe7996f602f2b949afe/93307291993.pdf
    • http://amandatravel.com/userfiles/file/25548782581.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083efcea7ead---57493409856.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/df94db2719ebe690b9d46f778fcef7f4/56268392686.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa3a161ed---75416803758.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nclex+study+guide+pdf+2020
    • 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_off0000ec9f.bin
ba059e9faf44b4357a2f7407a3247e56fd97a965c7b92862bc09adba4dee2aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 5428 bytes
font_01_sfnt_off0000ff56.bin
4e27b333104db3237dd669ec47c1a5e2009e9b55b578b93e38f0fe218e3ee202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 11056 bytes

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