Malicious PDF — malware analysis report

Static analysis result for SHA-256 43976d5556fadb17…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fdee7eb6d3fb5582760cb329e923fd50 SHA-1: e08d5325271c2663acfcfd693c7c41be4a5f9bb4 SHA-256: 43976d5556fadb17fd66ba7b6802bcbcf6b1b816abc920ae121fc20cba817157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://change4best.ru/upload/file/zovesore.pdf In PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/33799452473.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44247aeb21ba919a26f6814f1180fd92/wiwewejanel.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf928999b---sobitulegoreke.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/tidakumemuku.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/30343715155.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5d5b0d98---57558030899.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/venukexopikebegaje.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/bolitori.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6da16678c38c9044ce4998dad0dae4ae/74557247011.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/81351120241.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/10983672879.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/mixedakulavixenit.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/9666288260.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3edd015984035b8497d7acab8fb7e3df/jikiwefutovulazagasuza.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/67471433135.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/40667634701.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/3412567201.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xokikem.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/pafirik.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/lemuzapimaxax.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/gesarawerunex.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/sabinawagideni.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/zosozaguxesobedasevijono.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904235847406320.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/905d3a2ebdb5285da7fd53ff747d0991/80107813329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+quiet+place+2+tamil+dubbed+movie+download+in+kuttymoviesPDF 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_off0000bebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBF 11420 bytes
SHA-256: a9e2c276a0b757ac6051889eebe2ca286f553e791bff33dfdf69f14f26266ef7
font_01_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16272 bytes
SHA-256: 505a4d64c3d8c7113ecdcdf4cfd0738ce0c1340ae6a541c907ec91e3af7dfdd5
font_02_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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