Malicious PDF — malware analysis report

Static analysis result for SHA-256 065c03f2060a7580…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 14:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d9f6b196fd8fa335f6a8f0fcd442ae5 SHA-1: e931979027cdab83176ccd0c5fd09087f0bdc442 SHA-256: 065c03f2060a7580a5e06cc7fcb57646db2c069b40b8563a95840eb79ed6f91a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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://krajinar.cz/soubory/files/943606098.pdf In PDF document text
    • https://argumentua.com/i/file/40732054368.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/matawawinunevotanejanise.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbc4d86f0---daxuref.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140639fa7e3d---wusetunividital.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614248abb03ae---rikidefolumufaraxivege.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sevajusuxelewowusaxapipul.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/24187847542.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/73934054569.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vpn6qha3a46a1snnj44a316eho/wagoditer.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87707565129.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/58864701793.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/50389260424.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/buwatilegumi.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/nepovijegusafi.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/21035363520.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3c93f1921413b65ec9dcd2564be442cd/9290351302.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/4344df077ed668ec4a96594a84e2ae46.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/6213951568.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/57613187618.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/xoperazuj.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/46939998720.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/bosibamawoverabasuvuvanem.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394de736f42---beniwesaxise.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/22518779499.pdfIn PDF document text
    • https://hirurgija.me/files/72212345176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=speech+to+text+automatic+punctuation+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_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 10840 bytes
SHA-256: 9c042d1e7a33a548355d2b93e6034336312b50eb6bc0c8ce0a5e24f733e2c7a2
font_01_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 15680 bytes
SHA-256: 140bfb2e1eefe30c3d0bf8e976e8159bae0bfcf4ca3aa02fc2c99f9f5c35fd2c
font_02_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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