Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c245827d437f81…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 01:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f08a72f8364473e7d793809400b132b8 SHA-1: 6c3872a2fa5a33b07dfb76ba1bfe6ab1738488af SHA-256: d1c245827d437f81d9b93ec0dacbfbaa66c78fd8f7fd4c3f2a99736a8b2f0211
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The presence of a feedproxy URL suggests an attempt to disguise the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8d4900f4d2ebdd97178ba49083cb4568/zekafunijuzinanoxo.pdf In PDF document text
    • http://sahrugs.com/userfiles/file/36871266314.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a5dd14f3---78704325648.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/97263653719.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/tewubiwe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f57f27a28---36289411619.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f888fc39e9---34071342753.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6916c1f04d3445b54d22f6b0f057b768/fawuvepe.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/woxasufikedezatet.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xivirijonowulubajara.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c8d81c262---kovasokepekoroda.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080265ba0287---2582609267.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/piwoxe.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091197e6f280---gezixo.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kibabegazemosatuje.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/rofaniwenukerosotomewaxi.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fakujilikozima.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/ponigezaw.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7572eb307---69603889125.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e7d33bb3c89665d1878165fd14ef6794/72361870073.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f80tjgtqg4q5c29f256ps5qi2s/sogijirix.pdfIn PDF document text
    • https://anakmeong.com/contents//files/36938534463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+download+adobe+pdf+reader+for+windows+7+32+bitPDF 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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 11036 bytes
SHA-256: 37eb01e33c1420e04f00226b746e7afbd9d9e1965406c3160a7939eb8c864afe
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 17416 bytes
SHA-256: 04793d09653e0c96851bef5aa88244800b6de647ef0a53e8aa00a10031f89e8c

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