Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bdb9d93efda587…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 04:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a62e0f09e4f2fc54d07037949c2078b9 SHA-1: 94b69e0c8cba2c91c18e4ecee3492ae299688bf3 SHA-256: f2bdb9d93efda5879f314c7f168428294c472a1e38901d7f465c85e97f44edbd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a tactic to leverage potentially malicious or compromised infrastructure. The primary attack pattern appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://longarmacademy.net/fckeditor/userfiles/file/25334856163.pdf In PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/sodageludekodokipivase.pdfIn PDF document text
    • https://airbays.com/userfiles/file/lojulole.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce37b90ccb1---3359009626.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/jutubekatukip.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudubadewalew.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/28044351277.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xuxitaw.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/duxobejofexixetodokulemi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236fc8cabf3---10015567347.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/meradaji.pdfIn PDF document text
    • http://hongdacable.com/d/files/80619880942.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94fa95436a---senuvu.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xetex.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b227fi9929u0vr4613crmekrom/67838854930.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/87dc88ae4b62049e6f7422b58271004e/49984418996.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/lemirijorezogizukixaborek.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f48265b0456---zejetizowogezezek.pdfIn PDF document text
    • https://angkalaris.com/contents//files/fezogud.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51ff63eb0---tigudogejofo.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/3170197817.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/dilanodudawelemevir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=freaky+friday+2003+onlinePDF 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_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 18520 bytes
SHA-256: 32f1b0aac08456559424dcb186e5ee642e95f1d195b6be94b75de41fd85158ba
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10676 bytes
SHA-256: 5e39cc588a55c384e088b264ef43d226f063fb0991572aebf2265887c3df185a
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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