Malicious PDF — malware analysis report

Static analysis result for SHA-256 223679ec21f54ffe…

MALICIOUS

PDF

80.8 KB Created: 2021-07-01 23:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e02468102f952a5401ae26be6761aeb SHA-1: 575f19d813cd57116628526cd208c776e8b63f60 SHA-256: 223679ec21f54ffec01011f4dcdebe1ba7019e356a1b548da2be3ba4ea1f7d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=all+of+me+piano PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/drf803v6lm47a6ni5mv1miloec/45391151759.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-21/20210621175106831575.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a201a3898---60494305740.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/45765829002.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48239488844.pdfIn PDF document text
    • http://abnicum.com/files/file/2524739630.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a654020e1---24584001134.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3634fed3140792aea05cf4f917866607/xolajofojiruvu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/7589919470.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/83432354203.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/pefulelidisixilozeke.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/bifabolav.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/49357692681.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb9c9787d---10699766733.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/11662274316.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2da2c7bc0---wokuregadelowozokiganabow.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/080f1712c1d688a75bfc07c3acfd74ae/jobodavumivatatiweda.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/58613408460bbc9e7c2513.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0d4bebb0e5306193b7b3b73dff104f5b/60899604378.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/11666591537.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/juwefawediz.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8cc3b3236a21d3f5041a76dd38547885/67210789709.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/29a5af60dfc358e8e1dda2a254f29fc8/fefoguruxefab.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0928058361---motujomovumidopo.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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 10136 bytes
SHA-256: e8bcedaa06b803674090411afe0f8f2ece5f48c00e646ccc37761e970364ce4c
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 17024 bytes
SHA-256: a2c72ed937ea61604d05c0aa34d203f0adbec61382686479e4aea750f203aec9

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