Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fcd21f1cdf3282…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 18:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf8254e8058b23e7174db9103aa508ee SHA-1: ebe87a71782c6a5be07af211479ef20f593215ea SHA-256: 24fcd21f1cdf32823c8295d9773af79638a6da37e53a4ebd1def9cf5492d3842
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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=roblox+hack+robux+apk+mod PDF link annotation
    • http://stalmont.eu/userfiles/file/rotowizoradirex.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25155445851.pdfIn PDF document text
    • https://songhong.info/userfiles/file/migud.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pepuguvosu.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/6598967189.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d417b16b4d---pabuborotorudevo.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/66117477417.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c73bc03d5---pidojetapasubexuteka.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0e8d1d66b---savesezamonexenuvopowiko.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/54717830974.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613770edf3384---lolimomawolanuxoz.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141383940a3e---89198306624.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/68277402664.pdfIn PDF document text
    • https://kaparatt.com/images/File/81538746906.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042e221b57---63389990527.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/tivux.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-17-22-53-04-78.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/96877727182.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/29487420089.pdfIn PDF document text
    • http://epicridesnepal.com/files/94361833912.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbdae5521b---90261916170.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba4b6d059---67591585687.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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 17548 bytes
SHA-256: f8741c462c2e37d17d29f22010e45bde9a85c8467ada543dd4d0d157c251de2e
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 10664 bytes
SHA-256: b342ebd75d8d1a68c779a55b133c2aa0e7e13a42a1a5fbed375b86aa0f02d570

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