Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb528db914e7802f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 14:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 29568721b50e2a38f04787e2aff7ec57 SHA-1: 579653936828153b5e8dd2f479b3ec3a5388ea49 SHA-256: fb528db914e7802f172e4991460f71b3154d02870d5c0f96b4215abc559d9bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links and the 'link farm' heuristic points to a common tactic for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=vishwakarma+puja+mantra+in+sanskrit+pdf PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe292a1d7---73597567933.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/vajunikuruzakekevutokufos.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/93445171810.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/mj89o8rpfnqib2tlb7qemjb60i/39693539100.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b86269bf9---fobotonuzadofem.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/gotoz.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/11172364980.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531194303.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8s40rr7q8p8m45701gqrragke8/29110205716.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a2760492---lezebejurejaxidi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/58fvsckn8ej9ppmn6rn007sd1pfr70es/99684818463.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ba5cef33fcccb1ce59e06312a5d25ef5/92960838757.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/5139380360.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d5379551f1d28e33de2428d57db148d5/tewukelaroda.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/89420798281.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/11046152182.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/rufazejanefodap.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/35567820926.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/selofuvelakogejuk.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/10b6415d266bc61a3d9f5c2941612354.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/37073202769.pdfIn PDF document text
    • http://446888.top/userfiles/file/zajosilototodigogidadawug.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/229cd438883fdc562d8dad18f27c3c7b/31801459442.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/sopebasemujuwivisur.pdfIn PDF document text
    • 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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 20392 bytes
SHA-256: aa08c56e1714769486681e7d3d97362b6c99ed40493a043a6f76c82f41bca211
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10844 bytes
SHA-256: f2e1b78b5fa62fce6509022283967a969ef173592700cf002a1f51b34356d7b4
font_02_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1