Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe38b4628d2dd76…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 988185215d40e49886f8f3e9515e5cdb SHA-1: d36a5bccee83ea4b0c7ea0d7f668e67db19b7f54 SHA-256: dbe38b4628d2dd76008fc316f8db79e74883815996d3130849f080ca5007b078
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates the document may instruct users to execute commands directly, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://chcial.ru/uplcv?utm_term=remote+desktop+from+ipad+to+windows+10 PDF link annotation
    • http://dxline.eu/userfiles/file/nibosivogeno.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/37054012255.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/tewubazirupimiwul.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/11401587025.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zusebipolu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/53245403008.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/75190648740.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/petiveju.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/29204043961.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/9357803920.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/barukifizubafe.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/vipexenamukosoxuzov.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/ziwokiwixojamo.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/laminupugibulinizazozod.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/diruvuk.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/fekolafokeguzofixidokum.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/15969453836.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109011107479537.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452ab1c638d---65877051518.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hgtkodg99aedpcam87pd3e9452/46805039763.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9208cf2a9---nolimawasazoritaxigo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d98215cff---41759556335.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091811062670554.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 18008 bytes
SHA-256: 121f2c57a0a1f4aa816df522384265400aa48fa2ea2894a66b2ae65b32db1709
font_01_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11008 bytes
SHA-256: 82a7d63067bb04c06a7373fc6987b547b3f7ab9af328065981b3d60231fd7203
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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