Malicious PDF — malware analysis report

Static analysis result for SHA-256 430fecc7251c238f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 02:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da2724c50a7cd8216256fb82e5b99b63 SHA-1: 38949d6540fd391bc7a9538d6ff6de0fde8bc37b SHA-256: 430fecc7251c238f1d648a5f15673d364a874daff05267b7bccb1a2d1e92222f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=sonic+3+air+download+apk PDF link annotation
    • https://vnjhanoi.com/upload/files/43257937372.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/rizibaliwule.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/kajoxuxativasani.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142e797caa78---77167625377.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614665755c297---14558664779.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/68196373341.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/bakixipamifiwa.pdfIn PDF document text
    • https://wonkingchina.com/d/files/98516602738.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd366a2e1c---98393273252.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/47732986461.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/67474163201.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/93796448436.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/vevotilugijijakivala.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/53047696281.pdfIn PDF document text
    • http://gptools.net/userfiles/file/sewinavazi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/68178314439.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/ximadudopokupapofoder.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/36134859978.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/18evka5cpolfm72ro8sl6aeqnn/52710840676.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/2066261479.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/89739280350.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/39190290955.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161445f976a6ba---26171814467.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/20158401742.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/nogiwonipofabovo.pdfIn PDF document text
    • 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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 17148 bytes
SHA-256: ea3488cb2e71cb94676a6a7ceb3fe08261f3ab956ae1f7ddba7dbdeb23627965
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10532 bytes
SHA-256: 7a60e01ef9d64a9135d90f7aa728c4fb6a0a20592533f30ff29a015f0401f176

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