Malicious PDF — malware analysis report

Static analysis result for SHA-256 2504cf2fc405d64c…

MALICIOUS

PDF

69.2 KB Created: 2021-05-22 08:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d813255b9528cf06f7ba851be99ac04 SHA-1: 8b9637a57fce9f5ab0e1fec9e714dc21d6a28785 SHA-256: 2504cf2fc405d64c0ad7f94478afa9b846c9115da176428a930e4450aa42de65
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing based on the URL content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=10+ejemplos+de+sales+oxisales+neutras+con+sus+tres+nomenclaturas
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b281a10b---torekine.pdf
    • http://atenngo.com/admin/sites/site/documents/67945368960.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fdcq0jmuuub3ri7qku0osdmmql/74656981595.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d6e157fa7527498ae4aa867c98fdbce7/nurijurigujajifo.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/9bm5l3e54p0h1t9ogunfcqcoql/73727997286.pdf
    • https://euroroma-bg.org/files/file/74408903070.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607251943ad94---61255524328.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727a08d49eb---28224004846.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d1a5ada0755d166cad3daa76472d06d4/mimotitojowevijojamiwalu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e751562a---67927399630.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fab95a075---gexivopa.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca98f26e0---gatagipefize.pdf
    • http://jhferry.com/data/fckeditor/file/%5C/tapinimatika.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2be1d23196dd06ef32866f1713108c99/99562441228.pdf
    • http://roocenter.ru/upload/file/30147464540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c741.bin
55ec207702bf84cb9864909288aefa525dfe70bb7c92967a0692cebc30632455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 5344 bytes
font_01_sfnt_off0000d955.bin
1f1abcf8ae1174db7fc8691c99e5730b74a34ca54fcebe5cdb8b58c5b7632780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 10496 bytes
font_02_sfnt_off0000fbbb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 4324 bytes

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