Malicious PDF — malware analysis report

Static analysis result for SHA-256 46536364d6a9ca07…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 08:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a83682e42bb5d61f5b1b60b0c5277a3b SHA-1: 1824a8fd124e97d70643012542713fc12e840869 SHA-256: 46536364d6a9ca07f244a00cf678e282c569b60358bdaa3e3267bb0dae57fa1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://neteyes.eu/editor_up/79318197488.pdf In PDF document text
    • http://primaria-ciocirlia.ro/media/file/texiti.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/31027746628.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/darulovefojibulibelidinu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11113bb6e---mebafolasobasis.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/jazur.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/jawaxew.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/5937392874.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/fafoxuruzofubuvojamafaxe.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/gijirimidudivifafozigikib.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba4692955---sejikidas.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/givogakimefaned.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/89395932630.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/pituzujuzivige.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/46662267744.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jatuxopejolapapili.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/48686308787.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/5992662271.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f7a3c3ea---tawajup.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/jepumefexe.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/62544328609.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/62581300405.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/582974827.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/ropetixebinikade.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/43853247452.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/95568788445.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210912231216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pro+tv+pe+tableta+androidPDF 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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 17052 bytes
SHA-256: da9cd1bdfef1fa906d916152031cf3af0ef0a4860051638b17c092a6b96a4690
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10424 bytes
SHA-256: e807f4e0eeb676cb8974320e89a155ebaa18db3e40632815e2a84af41b830a44
font_02_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1