Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c7a95ab1c4dc0…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e2e87a35e7d3abfda401eb907e11b01 SHA-1: f41b6eca234d2ca706cdff9ac1f8aca085f28e3e SHA-256: d54c7a95ab1c4dc0824d234b825219f2abef7ff43d2cc95bdba527aeb467796b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of these links suggests the file is designed to redirect users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=manual+ministerio+da+saude+tuberculose+2018 PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/449d36d6374f0dd6f49a0f61e7bf0810/21207251432.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/vavotalezogajuvesa.pdfIn PDF document text
    • http://mfcpavpos.ru/file/gusaziwedari.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/buzat.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8c0efd068d061244b81f09aea3198f6/kelubodusototigo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cb55e37f85eee775208c04e722964d6a/98705267927.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609273f50d4a6---94749788773.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wibewadaropagopavu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00d1773a6---73946240753.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e56c36af6---97149591972.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4jkk0nq4opo60725id9kcn4j7g/lolepatuwolunuvereg.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/nuwujobozexurubu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/golirutaro.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4ab46e06814188b331fd85cde81fec5a/pufedanezefobotozone.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/kumogulizajuxepo.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/sigobutomejegorebekemup.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/29147458516.pdfIn PDF document text
    • http://ipceurope.com/assets/file/94668936222.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286c17875e---11370588743.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/dizonepovememuzuzisono.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/62aa440c8e98859c5813ed14c7bdc884/93988054911.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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 11264 bytes
SHA-256: 072390cf1843230b9b83ace1f3c2366133311aff2edd44eaa5b1be0bfe914a2e
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 20368 bytes
SHA-256: d61de0a35520c957f864999c82fad68055e225a73e8af1478bd2c15ad8a0ea32
font_02_sfnt_off00013b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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