Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3535f77a3fa97…

MALICIOUS

PDF

84.2 KB Created: 2021-08-15 22:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52280ded45a1c5f090b5eb9e950d0530 SHA-1: 5d1e3cff07a0de1ad25016562d628fd899a1ae40 SHA-256: e0b3535f77a3fa972f3342ddfdd4f3c70dd4acd8a6b6c868a664e2f1a88cf111
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f41923d966907dfe56a814186d6bea05/42477488312.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c978773678c---4347472163.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/287f7a133c280b3de5b15dfa747c5bf6/57076836128.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/goxakupazinazu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/76582541227.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fc99ad1c0f8---budamujusugowebokobana.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4abb5fc71---reles.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c06b0dfe600bc3e74f7f2664b28c0838/52094428308.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210731_B5ED82C937F30387.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4faa9a2c---75274129101.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2434dde7d3---butagexebosijopagibije.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/depeniwazali.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210808_025843.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/weviloroxavimiveka.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/manuneposapovireferik.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df9818bcb---14434839883.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/vitugudegezab.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/goridivijo.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/garaminifomakon.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/gizotesiti.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609564cb2ea4c---77463537001.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1660951420e3f8a604ab4e09d4735c0e/65607662164.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab2b12156---95105653908.pdfIn PDF document text
    • http://bwc.lt/i/damodajozer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=phonics+workbook+grade+1+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cf0b7afe---pebajoniluminuf.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16948 bytes
SHA-256: f7d638b0a660650db990252677786576b2a5123625e97c7b1340fde0b35a98b0
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 11128 bytes
SHA-256: 6565a6f7944bbeef193661923551e29c1ff3e40c90ceddb63fc7c48449c87454
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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