Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1d9054fadea583…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 07:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4e438fba246d9e833a4a65bf37a2155 SHA-1: 3cd9b4bb0b5285a1d566e4b4dffeaabfdbe416c4 SHA-256: 3c1d9054fadea583c17c20afd1afab3cf80907dbb11b17add5ce400a80bfb28d
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The ClamAV detection and heuristic firings indicate this PDF is designed for phishing and potentially exploits vulnerabilities. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 6

  • 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
  • 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://corumosmanlimakina.com/js/ckfinder/userfiles/files/xatuva.pdf In PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/47863924447.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820f0b8892---39150853085.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/57501677543.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/34474089180.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/1905041604.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/16361729039.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614545f87b4f2---74016454506.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-18/20210918074440609342.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/75052297958.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/lakesilowebelirigosixa.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///70803432664.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/23922594567.pdfIn PDF document text
    • https://onlinendttraining.com/files/9383856786.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/15476076690.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/16981960550.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37852664097.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/taburar.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/kediwifumanuxudupazumu.pdfIn PDF document text
    • http://sql110.com/pic/25346571900.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/16608764337.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613401933e6e9---88989673767.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/1639322744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+photoshop+crack+version+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 17472 bytes
SHA-256: 6161142e87b850b37498740e2ba43db82ca6a625b34ea0d2f2a7da88ad49ebf0

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