Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf7ec7ff0d362d9…

MALICIOUS

PDF

79.5 KB Created: 2021-07-02 21:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f04ccba4d8967b5891345581fec9b9a5 SHA-1: 6e5f68a96540fa33c95f681964709ade91faf667 SHA-256: 1bf7ec7ff0d362d9137c70ed7b8132400da8b050d7e000ca7db49c3c06681aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier's high confidence score and the specific ClamAV detection strongly indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb501be7f---sugawibij.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ce73366ffc90f55b11b082a7002ad520/bitodul.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/fusuxofe.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ruvomelunebisodegepuneg.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/65688689188.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/78633577640.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/katifofegidixabaxuselo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/81a5ba358f199a446684cd68a1f20966/55610269562.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7e37ee5a0c90ab77e2c0f9215dfaadac/rigimuzulevori.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/be12c8c7b6a6e1510f6fec5bff281213/goratubi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad9343fc0---vewumafowexurerovukamatip.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/danibigisebewekegovivexox.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/ripegikojabutidosokize.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d268e11098a43460318f4fe0e6b3b4d1/32316244348.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ve2se2ditlcijed2964u5spp25/18670333256.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/duxedesowajomi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/38052453863.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/597a362d2c481c6515018efa916ad0ed/38262072012.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830f0c7b284---57783927585.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sf84fqceqhmgc5f5fl1uicdg3e/sumixowobabidoxetefijas.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9401b961e---16036343593.pdfIn PDF document text
    • https://tavio.ru/files/file/15671592245.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/3373341509.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff6afc8312bd270d2d2b8e61e6609f79/juwidonezejozifewolibipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+week+in+the+woods+pdfPDF 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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16436 bytes
SHA-256: 844c2120ec9e20e3f6099500c7b70e2d261c2d71a62e1bbf9d4022135a89e095
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10444 bytes
SHA-256: db05144f5c617732636b64731a7b3ae4aac3d2c1353e70c624e72e66d4fcd100

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