Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f1c82c59e00d73…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 09:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cd7806689c80d189d4d24bd88625dd3 SHA-1: ed71896ef1fc2334e392da3f06075c2809da65f6 SHA-256: f7f1c82c59e00d73eff0e3a0a6d677837d72ada8c57cd8e9a66d5eac18627f7d
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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=tekken+tag+game+download+for+mobile PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/pajukiwov.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/milafofutaxemidapubokog.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/vawavu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/wodegupafelazururupis.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/rerafidinatuven.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/87388259919.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/zejunarititup.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tupetudekokegapebujogalaf.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/zixakowi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1eb63f90e---52961193658.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/1261641883.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/85084318843.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/64664833329.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/rideranisamawiw.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/52670414339.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/fejefore.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/pimuduk.pdfIn PDF document text
    • https://eclearusa.com/images/file/vamodowusuvox.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/71754561155.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/23017581355.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec7d76c7f---70302477957.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/07d5852927745b6c49e9ec5ceae5c0c8/posil.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xinisisuviluti.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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 10812 bytes
SHA-256: 95d8ef217d25e6440bb1505ffe91dec30a9b8591dadf6de2972d8da3e349ecde
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16900 bytes
SHA-256: 9c4a1604c552930d67c366812327862ad1ac54f5e6cab039ac6b62972b025974

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