Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e83a857aeb56e2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 02:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 462dce29886dd44f0a15df50ba64a51f SHA-1: 0feef464a32cf9679193d8164a737b095e18fc64 SHA-256: 12e83a857aeb56e221c2c1ad3c4a2b071e7c4c7e159ffebe44d0a394e5d8af6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is likely used to redirect the user to external URLs. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://lobanowscy.pl/userfiles/file/sotowuvon.pdf In PDF document text
    • https://4cmedica.com/ficheiros_upload/file/11131515313.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/feec6c8827066079f751e418220bc560/84099447270.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xubonefebizojepafagipowo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/99818621975.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/wabowezuxekanudele.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/34442225804.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/faxafodulijebajababavodu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/38646041668.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/kaviwokir.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gadatusuzikuvonus.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a6bde349e---3383525796.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/21685590341.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/14005172950.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/99941646589.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/49042987412.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/56282640072.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16151bf849d5bc---masasoveziwodevetiju.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/81028188387.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210926_121709.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/tuvifenerejixudaka.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/19424876859.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/84915021385.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gewomazag.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/94752306740.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c800cec636---tikelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+detik+com+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_off0000b4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 10648 bytes
SHA-256: e46ec3cbbb545bd415876fd545dcf0e016c5f3cc64a90758c95bbfa11e4a8cee
font_02_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 15320 bytes
SHA-256: 5960c32e2989036ed2d6faea61dba7aa4c67311ab1f49fcb1755edc0633e0f2b

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