Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d7814c7d25c765…

MALICIOUS

PDF

95.5 KB Created: 2021-08-07 18:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6eee70697fed68f3b24a6d20abec28bd SHA-1: bbdc0f0de60ff690b7932731cb678b30b7012f8c SHA-256: c7d7814c7d25c765519c5eb83469d169656e785ab7dd10358f6cc0bbcbd1d29a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sofia-es.tokyo/yamituki-n/uploads/files/wonubupejawagigebak.pdf In PDF document text
    • http://pnalog.ru/images/file/gaxuxusinivuxufolinotipur.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/42191306686.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab170454ac3---kifirasowolikixejogur.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/difexezifat.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdac83e237---zowegazutijumepixipuzofaw.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/55497974331.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/jajoramuf.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a4449477a---gopopumimesiworidajalobi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/75274393147.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/11rl6j6r64hk83ddddqe7rkph2/tewovokomunan.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5e4122e5---97775747309.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tumufanewasibome.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/gafijojijiwakibo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dec0f4f3e19a45700cdcfbffa0e63f64/vutaxunotemexosuraxugup.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89380a701---sutodewatebu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/60f0frnrvoq9dismai0tcpqsk9/59560134180.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cfab5d176c265aecf95e4ba8f2fb632d/laxuzefodurufemix.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/relav.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/nisozimara.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f839eec09---75830651697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+kidde+model+numberPDF 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_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 10592 bytes
SHA-256: 0fd017ebb9c5962cb6a242c0a4d4e8c61d9e82ec98a29f1cb4e395f200d4949a
font_01_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 17444 bytes
SHA-256: 51c5b964bfe748e8d912a2dbdcefb81cc8e3cb85a36b10a4b95b5970123aea12
font_02_sfnt_off0001585f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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