Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92445c7d7422f63…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 11:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 685a91cd596ccfe60488c20cd2ed11e2 SHA-1: eb930535d29d7a009cdc943c9b6f57293f0f5a95 SHA-256: e92445c7d7422f63edd4fa628f9a014d39ce6a9d765e61ad8a05f005e1cc4995
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 as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or engage in phishing. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination or to leverage multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://usssecuritate.ro/userfiles/file/34724849617.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1847bede3ae2b77811c3fd67057ff5b1/73413054614.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/84c039a76fe98ce9bfb58236d9883c8b/24623046927.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/76ee2ed03871a5ebe3ee0d5ae0d71ee1/69863264098.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/facb14cb9a53b9023aa2fdd680c90f70/94145606148.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/826073984.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161143495bbf0d---13808493288.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/22936204330.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/ledemawulomovesa.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/5549917904.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/tatezunevirug.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e6096d756---96826440720.pdfIn PDF document text
    • https://wittnebel.dk/file/25983498250.pdfIn PDF document text
    • http://sun-tes.ru/files/file/gasisuwexu.pdfIn PDF document text
    • http://schubert-hh.de/image/file/23398538647.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/84001468108.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/88lit813j9n4t64qtg3i9k7qh7/71864588420.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///1875882562.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fusobabiwezisof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f03def00f---dekalipago.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/176736837.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/77269052141.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/4r4qmctagqpqc57v7ff2vksckm/dobudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+breast+pump+electric+or+manualPDF 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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 16856 bytes
SHA-256: 7c534adf604ba2fb684ac3016c558f9d5874ee0bb82c0057d464c8623676a4d5
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 10828 bytes
SHA-256: 0142fd0b7c2189a92b930f1eb93bbf1c38f7713edf7e2f90a129f3b05772e01b

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