Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ab9e76bbb2f994…

MALICIOUS

PDF

59.5 KB Created: 2021-09-15 20:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f195430ebf1d9f8e214bfdb99821aa74 SHA-1: 8d81b72cf8489b5a56484a4dc618019d5b257e17 SHA-256: 20ab9e76bbb2f9940a44a2a7ed7c6255b105ecf6a0e2d2d39d6310264d102019
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8279

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 https://pixomot.ru/uplcv?utm_term=proteger+archivos+en+android PDF link annotation
    • http://take114.kr/FileData/ckfinder/files/20210915_41DEC73251BBCA29.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/90174049088.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/50817753666.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/54920162905.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ac08539b---bixaf.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/80690455944.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/5761097451.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/27644924823.pdfIn PDF document text
    • http://kgmda.com/upload/files/rolutagozek.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/gokumogoj.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pilewetas.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/65815828418.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/korijeneragefona.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/firim.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/951931462c75ea21419b03cf4663ca11/rivatizibajonal.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/mukazonuwenu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/kebupeletoxirefewukere.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/17837604627.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/713dc145900e856367bcf85c6002123a/12660717821.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/boduzonisirugunizuwubepo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3927f74---65232501338.pdfIn PDF document text
    • http://evola.it/userfiles/files/gafibewimo.pdfIn PDF document text
    • 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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 10672 bytes
SHA-256: 46773d6c62dffefe8c70efe64a1ef386fd8cb450e035393c00710c1472073e09

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