Malicious PDF — malware analysis report

Static analysis result for SHA-256 a121530d63c9911c…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 15:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4211f4052b81c07d658c716049d2a7b SHA-1: 9807ec9349b84236eb3c565b18383bfad2dcf6cb SHA-256: a121530d63c9911c379ee5ed689d47caf45b1d818ff151f422b34368a1cc8be9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3728644a285afe226097fd87b65ca51c/12509675151.pdf In PDF document text
    • https://hoangnhataudio.vn/media/files/74391673917.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/porixuxupaku.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cca12169a993b3f574ced11f1dbf01c0/47550371659.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/68862703937.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cac8c1a7d565192711e3556ce82d6331/genonedefutumimab.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/todavoxumazirapaze.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/nikawazajobi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/87000792218.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/35885573853.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409518f95d---sebex.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46279fecd9098fe401aabd18741066fb/12809876240.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/vidatanikudirali.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/21896707043.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0b32a62cf9b4a00901dd22a231c47780/37302594901.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1d1ca1332588f3547cdcdc79f40e88c6/94656437691.pdfIn PDF document text
    • http://dzbnf.com/upload/file///63430335939.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/jefixusogafufel.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pqaj4ceu8taj4ea02kvr4fg800/47881868538.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/57887097993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=original+not+ready+for+prime+time+playersPDF 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_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10980 bytes
SHA-256: ae717af0c3a07829f0cf997c0b492c9ae1b68e31e22b681959589269bc4d4f9c
font_01_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 18256 bytes
SHA-256: 64dc7b3799b8c55051a7f5d223fef1e0f93b0a352e8ccd43ff1c7358cb93bf48
font_02_sfnt_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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