Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b36ba19c22a0203…

MALICIOUS

PDF

77.8 KB Created: 2021-08-12 05:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9156d985607f19b74e305504776ae59a SHA-1: 60925e7983625712e30b9b18451be4d720501483 SHA-256: 3b36ba19c22a0203a4f0d3251f2ce58218ab98c3fdbbbbfe5a9bdb7cf0d8ed0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=types+of+orthopaedic+surgeries PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce884caa4a2---nazuvujaraboduk.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160932150658b5---pasat.pdfIn PDF document text
    • https://wineart.online/userfiles/file/82390421438.pdfIn PDF document text
    • https://koratspring.com/upload/file/90953849531.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/3434325800.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1faa9da6---83488161730.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/6gaagb6kuigctgmfco3qh2vsm4/44298535650.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb94ac97b---xosejotavagemi.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/84518039156.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/pagotowarakakorumi.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/livalewafo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/58rldn7mnlkpe6qqqihqpl0h0n/76390800606.pdfIn PDF document text
    • http://toonesk.com/upload/vivenitukuzi.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/71836779165.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/kibopefexiziviwil.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a563a066d5b---89612417920.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wabajaxomenar.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/naxotegizejorafabegozi.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-10/images/files/talijabajos.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/60037356571.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928db89f0a1---luzipoximabazekedisusokeb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0907c89f---bivitekaned.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d270bcb0---94820515041.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/pijiwutopu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c830afadded6cb5a7a0d6bce9d99fa19/86865124321.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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 15744 bytes
SHA-256: b5de5d9ecf2771a9180e5de44a35362a88db6d5496422ebaa526edccf0e631ea
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 10928 bytes
SHA-256: dd442a2b970f7042cc63e0cca756ba16a98ff36b9349ff61009a8d2befbb539b

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