Malicious PDF — malware analysis report

Static analysis result for SHA-256 575f2a866577a3d7…

MALICIOUS

PDF

79.8 KB Created: 2021-05-25 10:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1ccd205545e3680b48b2105320066ff7 SHA-1: ec713915950e134842a835d0e7b6b88293b18788 SHA-256: 575f2a866577a3d7c1c5502063275a083445c24ebf3ed60d547c8e240fc3e3a5
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to 'sheet music' and includes metadata indicating it was generated by wkhtmltopdf. The presence of multiple external URI heuristics and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/uplcv?utm_term=dance+monkey+piano+sheet+music+free+hard PDF link annotation
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb06e2ce53---mixewuzuwokinulufokigelig.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b01af463---46703663397.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b68b997b6---3687207913.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc67275e6a---bikarorafiva.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hd5tj3rggptceml45igbse9otk/nejokaxuwituzepifiritar.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7fba51bd6be50c7a298694bd785ace37/92055012894.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dbdeec8815775b3ae79c4855661e2fb9/27279731439.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796a6eac4cd---dujozuxutowuxavu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0astg8ajocndvn8nhq0aactbjf/22024888132.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b85222f8---gozazasog.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tipolonolapik.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3f7b1b5b---pukirivupopavukemejuvap.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/467badng3gopihgtocne92d164/54916738301.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7d12d674---manabudaxagi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rovekozesurufapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 5412 bytes
SHA-256: 45d253c8676c692c97aef47464bae19a038774524d498835bb298553c5f644b3
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 10568 bytes
SHA-256: 7409a4192c479e026d870ebce6412d125017e2f08ce25d8c505e9fd6b847323b
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16956 bytes
SHA-256: 3a3e3920316e8cce0a513f8d7f4d1ce5cb0680ad0963a03a1dedf20804012876
font_03_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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