Malicious PDF — malware analysis report

Static analysis result for SHA-256 21df14bda85cea48…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 05:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e25c56e07e9ff82756b37f814017576a SHA-1: 531e2196670d7ff23254a817962e36a308c7565e SHA-256: 21df14bda85cea48c7ededcdb0bf7685599ea077fbe7c82861f60c65cc750acd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed to redirect users, with a high ML classifier score and ClamAV detection confirming malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=write+the+meaning+of+curriculum+for+the+subject PDF link annotation
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pudizovatu.pdfPDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/muketowulup.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lubipa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c4a5cc84---38819905066.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/u46jeord5rn3fb3uinj09jgvp7/46302049058.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/91035244633.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/23024334754.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/43880251409.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/15166748540.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/bujavukuwilukafu.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/wemukaxon.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/babalubibunumejexupig.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/52355974552.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pudumijasizav.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/63052796792.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zowalulemevikonijo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/piponofofavidogix.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/borawofateruredilevenumu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/tokegewekamoxakatu.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/74561421997.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5bfcacd9b---pibaguxusidakamogomi.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/10347493118.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_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 11148 bytes
SHA-256: dd23706152d43616f5d55e54513edcc49c54b87b81384799bf979d2976bb172c
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 17996 bytes
SHA-256: b710af2252934fc1d22378f214ee25be0c6fedaae4fa86cbaa54bbac1cb4980d
font_02_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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