Malicious PDF — malware analysis report

Static analysis result for SHA-256 521798e7c1c9b122…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 17:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 562160fdc7f4e628b1537978fce2951c SHA-1: 90cf840ac586c1170f649059202793295aaf18cc SHA-256: 521798e7c1c9b1224bfb55be27ec2de38922fd1f292e3b940f793f644bc70332
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c856dc28b9d---64096343941.pdf In PDF document text
    • http://csc0851.com/userfiles/file/20210905215849_tu2yh0.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/rivuxetebixi.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/38275987865.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/lotapipunuzaxoji.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kareputabarikowunerar.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/71595756992.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160874c061310e---sojoki.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/41714174926be937e8261da71bb0bdf6/ruluziwebekutotinita.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/54418884999.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/92811857480.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jevuxur.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/8442312950.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b8da6ef4b57316b9230d94fd07f2a1b1/xatixitis.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tojagupemejarijonikuxil.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/belakobujakisasenusagevi.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/93292770320.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/garotiwusalogitufofugab.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec0d5a86e---finod.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88397128360.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16123688a91ba8---luvofomazezetesetap.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876812c0681---kimakuwitupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manually+install+xbox+360+controller+driverPDF 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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 17840 bytes
SHA-256: 496fe5893d748a6c01e868617ebd549133da6ed1ad16b4920be69d2354f7426a
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 11340 bytes
SHA-256: b67180f77ed58cbe3066cb26167fec84fa4d4ec6259305b9d81b157504f41755
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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