Malicious PDF — malware analysis report

Static analysis result for SHA-256 c760d9c03b1ac235…

MALICIOUS

PDF

176.4 KB Created: 2021-07-23 11:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0e685baa073163b3fe7c8820430c92b SHA-1: 132af7a97a39f0facc7255e91bac5c02b6f27faa SHA-256: c760d9c03b1ac235c88b454030b25903880c3b2604d8e88b4bba583c03f37909
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 pointing to external sites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/88581221475.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-29/20210629110624120297.pdfIn PDF document text
    • http://rentaruedas.com/files/others/77235911457.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/61840138501.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/25838286575.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4d5l8p8rbb265f18fbr3fc69kl/29759381651.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9ed2f37bf50a210c8a8e1fffe30999bf/gojedolututetevomerofozel.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/vusozarejanimafodisumepo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jisigulezavibaxevuga.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vofabuxuzenetokezevuta.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94cc7e14aa85ba7c47df6548af40d5b8/wefugugozolap.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8427785b9b---33653155331.pdfIn PDF document text
    • http://hkalc.com/userfiles/1605551878.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1add98293693969f8291f513cb367e32/fovilewokirap.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3i54sial9nlig1scf5n2pntncc/39844711110.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e771431be55---29334998843.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/33i263i2b9f308kh4a1cosjvc2/8545048531.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/99770069624.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bc485314372ac25972d55ccb1b9d02c1/sategura.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604142423.pdfIn PDF document text
    • http://momsystem.ru/public/file/52537615482.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/36965571787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=well+labelled+diagram+of+mushroomPDF 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_off000254a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00026cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CBF 10832 bytes
SHA-256: ca067a353d54d1657244f2d271d199759eb5fee103f976b9fa00a8b42b318a2b
font_02_sfnt_off00028576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28576 17124 bytes
SHA-256: 4a9b8ccbd36ea1f2795a0debcc848af2312248bd949d91cf213ee724c4e89391

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