Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aae9625f2b28504…

MALICIOUS

PDF

94.2 KB Created: 2021-09-14 10:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12e46666594d8acb179f2eaac173af4d SHA-1: 020b395798d2e017c7b356a5d9d73c6dd56cc80e SHA-256: 7aae9625f2b28504fcde1dcaa66b73bec6ebd3dc8aede2cfe185932a0d6540eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PRC/3D content and the PDF_URI heuristic further support its role as a delivery mechanism for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=sonic+2+android+debug+mode PDF link annotation
    • http://proxima-design.cz/files/file/rupufadejenadaranovi.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/258005107.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/faroz.pdfIn PDF document text
    • https://begili.com/uploads/image/files/keliwigov.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e0b931db---lipijiku.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f1c107ff---zoniviguvetimuziwojori.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/wifimisesarezesibofapid.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/426a5288baefa7debc3e9bf3ec57fd01/72771452014.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f541318fc4---tetedenudijuler.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/851bbbf209db0f42ae8dfc133588f5f8/78226962430.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/89007040815.pdfIn PDF document text
    • http://sinostandards.net/upload/files/mivobimigiluvunaleresatox.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kizojidepepomudamavigapi.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/lerumojos.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/supibojoja.pdfIn PDF document text
    • https://stotex.rs/files/xefelokefibugivumi.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/65769860689.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/31696540492.pdfIn PDF document text
    • https://wmu24.ru/media/file/mufiramajemilulipa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q4felv2gpeanroa1h5jt9le1f7/kupuwukesa.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/vavobasa.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/35627103551.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/kuzemuwodovonidoxozetup.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/refusuvubafuzigoxenina.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/9580915063.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_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 19188 bytes
SHA-256: 141f4b377e05117f421eaddf4593d53114e07af03779a92a2fb1756e60daafc7
font_01_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15231 10836 bytes
SHA-256: ec65167ad98b9b0f02c4c0726e3f6c942090e53191c86b9eb3434193284e9a86

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