Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ff530ed091dbb…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 12:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 522a68fbe59188fd1e221828990cdd78 SHA-1: 75d9b4aec84c825d1d09bf8a8beec2135dd5dcdb SHA-256: 958ff530ed091dbb91d885f6682bbb3a8992a861efc0f8ef5cda59b97dd02428
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. This pattern suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=cashflow+game+for+free PDF link annotation
    • http://bakoca.hu/files/file/45979197290.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/91487453582.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/40035116656.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/pojabumaketa.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be991b6f1d5---geravovesusedokex.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6963ceaa---20136656285.pdfIn PDF document text
    • http://immopolignano.lu/images/68009854354.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e6c81b7f5edd478412ee0cad126d7a4f/vabevedefepebon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1ff98605---dukumavawem.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/qulmra4rngrcu2delmq324chk0/wizupukeno.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bfj8rpn73vhhgj99onoiihmjib/76787526294.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab55d12b0---votutegilewamututatuto.pdfIn PDF document text
    • http://ecole.ru/text/images/file/62493884630.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/obhfgof4e6vaj0oeiapij1793c/82054821528.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/25772916963.pdfIn PDF document text
    • http://allasclub.com/campannas/file/28179270065.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/3204736378.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/19445473434.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/10529288901.pdfIn PDF document text
    • http://www.centralperdana.com/file/7409704554.pdfIn PDF document text
    • https://activepymes.com/pub/file/sozitefi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b199caca8---17479103100.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b00d404d1bf5a376359db755e1288104/jimiserarupomi.pdfIn 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://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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10484 bytes
SHA-256: c82e80257af2ff81711c707d318a810567e21607dde0d6a2f7b9adb06e9a0c85
font_02_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 17324 bytes
SHA-256: 9f8ee01d0f1544d23e25ac4a6851970e062b2cdf9b2c630f79d2a588162af461

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