Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ec2868c7ce9dc3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 09:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2aed8c5ba9065d1967f934770de022e6 SHA-1: edc1e2885ce4b2b512bc85b9c4ae0441ba416057 SHA-256: 52ec2868c7ce9dc31aa91dae78cd3edb7ded0f568cc0cef2885f3ac7e7adf7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The primary goal appears to be phishing or redirecting users to malicious content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1eeb793642316ea2f0fc82b742231fa1/83092766089.pdf In PDF document text
    • https://rmp-traueranzeigen.de/cms/files/wokudetuxo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3eccb903b541ae0dada26392dfb3de82/61354717829.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/90905210917.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/momikukena.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/48508394172.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/31554273470.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s0v9as4iqt5ca15h4k8snc8r0k/posaf.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/54816644155.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42390070318.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/boxabujavixijati.pdfIn PDF document text
    • http://oris-am.com/editor_up/56493471039.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161387224e6800---mugivugusizapi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b5d6df32---38892678947.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/jaromanulesagiko.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/tajikelenu.pdfIn PDF document text
    • http://zaiger.ru/img/file/fokuxukefizebup.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/5545673506.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/82726419237.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/fupur.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/pikaluluninenudoralezu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kipujazupovaloliju.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/25989214388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=goth+copy+and+paste+symbolsPDF 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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 19288 bytes
SHA-256: d1fe723441ad11f5d6b8e441d0d958931eef62880ef172c6a7e123831d9346dc
font_02_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10880 bytes
SHA-256: 3f9587a856c1271ace2d39a9fb0596d317f4dfcffaedd03ab898f80d409ec3e7

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