Malicious PDF — malware analysis report

Static analysis result for SHA-256 d538e3603cf3471d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 276cc3a6600840c34d49f26b65f1193a SHA-1: 96758b3e08d3c527ee33b542380ed27bbdebd111 SHA-256: d538e3603cf3471dafe08a261570a132d63231ae94f11b1c58e3299fe70c0ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cf4154100a9e6f4a424a3323e698da25/suzuxifubamujojulo.pdf In PDF document text
    • http://dichvumucin.com/upload/ckupload/files/tesokogotageluleseviko.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3158fe09ec31523f6412fc0b3e44c47/76383913031.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/14381278756.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/kalosumagi.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vevubizakorilanam.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/ginuvajaxujime.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/bumononenizogufabune.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/feramixipaboj.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wujefevikalipepadujul.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/6092830945.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41910868305.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a87b6890---jikapupovogawodanigewi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/5596219242.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nfh1rtrgl407flcj4crbq88pet/96356537557.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/97528956363.pdfIn PDF document text
    • https://terracell.pt/images/file/gumulolozuweje.pdfIn PDF document text
    • http://fnathservices.com/upload/file/dubexileno.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/71799005754.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa7d126f---jevefinimagomejomojepe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161381a2ab7244---40754258061.pdfIn PDF document text
    • https://strechybenesov.cz/content/53331665002.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8c260d6d8c2d7f572f68e470e77b991e/rutupimesenuladowanami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+free+logo+making+app+for+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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 18264 bytes
SHA-256: d73331011c508f444c407e58c6361dd6c1404b47636145995d43ee6887115fdc
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 10988 bytes
SHA-256: 216791d2521af8e00c8e84c0926aa9e09923efa3a9bfc4b8b7b911fb200b4f5a
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.