Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2a891f902e5e9a…

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 07:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0dc655b0576d36c47e1f95fc772e08cc SHA-1: 9d4faf4e20f96c4e9d45d988552b3e5b82c3a74a SHA-256: 5b2a891f902e5e9a8b715067a3592ec0aecf6b15048969f3e54c5aa00d10f45c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic firings suggest this PDF is part of a link farm designed to obscure the final destination, which is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gptools.net/userfiles/file/37699134575.pdf In PDF document text
    • http://mabifitness.it/userfiles/files/18503125533.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/tabapigubozolu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/53275740409.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109070019235774.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/32770162208.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210929_D68012D33CF8C944.pdfIn PDF document text
    • http://24cvety.ru/upload/files/36090829737.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/kalekibimuvulisugofuvi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f76f931b8---82565434982.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/86373282410.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3a611dc99---43906366042.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/13246440931.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/muxeripopafes.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/dezoxogutaxuvekizigukos.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/noriretiwo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a52b5281fa5e1a8858dc4d0b8ad9f56d/wasunipunabesiv.pdfIn PDF document text
    • http://nincity.de/inline/file/buloxolosujagovaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150baa83eb0f---rimeregixisisawi.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/81840519152.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/koputinafum.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/85892477003.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/wuxogiwonib.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a097740e6d46d7763fa5310608529532/77112246996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=surplus+to+requirementsPDF 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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 19372 bytes
SHA-256: fbdb21c32d55abb5f970c8e09604600a10a3c849a28c66301e147a00817b5b86
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10572 bytes
SHA-256: d3e91fb7490cd4c23f0150ddab0b6254247817f3d794f0a3b2fea1568dea6102
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.