Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef345d5f38d6645…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 22:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff07948c608957ee015dc93a5582cfe8 SHA-1: b15a67afea55a050b5d5d5c69dd2dc5303bdaf76 SHA-256: 4ef345d5f38d6645f79e4f5a97d15bafce5ca6c93f7e8c575f502bb11983b571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://slide-bearing.com/d/files/94059340806.pdf In PDF document text
    • http://limeitec.com/upfiles/editor/files/bebofuriguxepo.pdfIn PDF document text
    • https://slotpt2.com/contents/files/tabelavagamapirezebisuf.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc65b6213---fikarorolemigazek.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sikejajunewanasafubo.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/losowizepojalo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135145c7b552---xoroxezarikizuk.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/fawivusupej.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b2a96a6cb073bfdb429a9594a94d26ee/poxitupomitaj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b337c47a47---49293589277.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lobuxose.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rofoxujidawagori.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/66556309452.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dezajukagomalewakisil.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/6898658768.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/88396274130.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/pipepadatafitubagilazu.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/66055564659.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/rotededuxomomigawivubip.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/36739163080.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc56e7428e---19404279821.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/33177955068.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=purple+iptv+appPDF 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_off0000b813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB813 17480 bytes
SHA-256: 8b2039b1139fe24e22993350f45a539fca0b61e2d131742617d398bd179766f9
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10020 bytes
SHA-256: 487bdf0a911cac89a921a3b3018c205585ab7db1deb12e2d0a6de1e40bd209ea
font_02_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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