Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea903d3d8b591f…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 00:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d40a1c8188e7885eb902adc5b403f2f SHA-1: e27d5618bd65815fb7a768cc101d2fe31b84afbb SHA-256: 4cea903d3d8b591fdee0eaa8290a2d0d259d185eb1981c85c14e02e59fc87901
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8139

Heuristics 5

  • 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
  • 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://2rent.gr/userfiles/file/simazomumelofona.pdf In PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/konunewipapekas.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6c5b8c9d3ff4834713666609850c0c81/kaferudipovusexabalodoz.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210804_194313.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8ce8a02---55951543763.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ae4ffcfd743330bd14535bb66baae630/voniketaj.pdfIn PDF document text
    • http://dgjst.com/upfile/file/nofamoxopeposifefokizi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bb852a49h33gfeqk4q9r1m2fnc/88810024955.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/lasemajejaxuwavenejupeves.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c42769671bf298a16bbd98ec0921154/59683054319.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/24453267381.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/46112208004.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/mixelum.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/pelenomisatuj.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/lozaxo.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/61857774204.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba2dd57e1---70111018258.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b56fa1578a53cda4e2c459bad8aa6f03/61107257667.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/toxirumosuvadizesutepoxi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3fb2e93f1---13869367714.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vozejifasegusakezove.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/66180052661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=subnautica+best+place+to+find+silverPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 17652 bytes
SHA-256: e11ac658c6ca0afd10098218a08b1220d1847126c6c7aafddf79671ea4f093ea

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