Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f9712531d23bd4…

MALICIOUS

PDF

90.8 KB Created: 2021-08-04 09:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1cbec236a13fcbf3a6148e60492670e3 SHA-1: 9fb3d88be8e60f48bb0bfd736e0514d5a6e440a6 SHA-256: 18f9712531d23bd4b7de6126ca915eb9fc2cbbda4228e2da3ec2d4baa5927804
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware installation. The document contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.fangjin.org/ckfinder/userfiles/files/27376515349.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/kuzoladujovuxexekujovel.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0808228a04---160141092.pdfIn PDF document text
    • http://www.asslar.de/downloads/28823252010.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff4c244f0---53468189003.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/74818998399.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/diluxulekopibel.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b322562c847---viratavewiwipatus.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/felofafajumabidatulobitu.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160863c48bc97a---7934922240.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bifevalusegolaz.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9721a49567b92cb6a699e0de9ae45659/vawolidewubixuxuzavoxu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758613548ee---newivuzifivuv.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/47761194713.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/ravasomiziluvataki.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bba3f2b---mazuvido.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2e876ffe---lapuwaxedazizazujunovi.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/masakubovuvojakipomew.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105271034218508.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b75f2484---lafotoxusipavipu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed40ffd0c9c---podisesojudalugowirupanem.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b764fc29aee---tivesufo.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/lakevimugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+factory+reset+acer+aspire+e+15PDF 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_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 18200 bytes
SHA-256: 1afbe2637b415b172b33f5ee4c77a05efe9aaeb8cca5e3fe38fd9e23dfc9f2b0
font_02_sfnt_off00014358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14358 10700 bytes
SHA-256: 98192ec6bd9b03c48d2adf2ba1d08a6b8eaedb5057f8091313a81bdd61730834

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