Malicious PDF — malware analysis report

Static analysis result for SHA-256 d395716bf2bec24f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6858e6baefa5bd36c2da7dc01d39288f SHA-1: 03010eb19333fcb651604fba41897762427b0fce SHA-256: d395716bf2bec24fda221379e094a8689bdda2d2e0b4a41a296dee183d27aca6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://edu-soft.ru/site/htmlimages/file/wudukizaxega.pdf In PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/67863572000.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3ea0ac95d6371f1703f5f287993cb8d/77188732330.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qv43dkfofuhi4ltgll3qk94krh/vudovezegabeseja.pdfIn PDF document text
    • https://amblamy.ee/upload/file/91270682534.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe841ed813---zinilatezojivud.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/poxinekos.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pm05gmjvb8qg2j9gb2c018s8jj/jarufovuranugup.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/vosofifikekejekom.pdfIn PDF document text
    • http://beiks.info/public/file/togixorofusovinegojogon.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087123252b26---bamegigu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/38ca1db289286b4a98ecb74188f613c2/mamofox.pdfIn PDF document text
    • http://cortabellanews.com/userimages/12402594127.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/35131534139.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8821a0af377e854c294aabc6a22131d4/wenomizaw.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/rikulujetupuwanewezo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/25766454993.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kupemugoroxigebowejix.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/wexasu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/36267224164.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nominuzowirimadigu.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/86623908341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=snap+out+of+itPDF 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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 19524 bytes
SHA-256: 2ea152d346684741d84ccff3ec41c90fc14499b0072139a1162081cb1e3a707d
font_01_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 10080 bytes
SHA-256: c7f181bc21c49e476e3c33f0d0c04c837675c1aa324c541620dc662a030e0766

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