Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11815fa2e615185…

MALICIOUS

PDF

74.4 KB Created: 2021-10-01 19:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6f12e282365ba4e77d9c4e3eeae0b9c3 SHA-1: 61159babdc033f64f4d652078a7e51327d8a93ba SHA-256: a11815fa2e615185d888d86b5ab07804e252e22d505bd83de0e39f89bb5d8569
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting. This indicates a link farm designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2b3d10180---62492416131.pdf In PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/23582889137.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/37176427350.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/11871123970.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/sosibo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903132032285019.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/10053766843.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/rixiwisiw.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139159bcf8b0---72755206395.pdfIn PDF document text
    • https://beaszemin.com/files/74222216212.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/lugozasopasi.pdfIn PDF document text
    • http://habibitours.com/ckfinder/userfiles/files/maxutopikatida.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/relimakozodapiroval.pdfIn PDF document text
    • https://geniodelweb.com/file/84086431889.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3beadfab00c6088b14f026921d4b82f7/gateferosepet.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/39313882855.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/21558287393.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2b0b3db3aa6772759cf87e07552d261c/zaxubilerizepesu.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/94536348890.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/sumuvigefibixadirewu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0e39d5eb---49900275261.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/43457659872.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/df4f98d529e317d8b2200813276e88dc/32746982536.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7467f95f36cb321fa796bce1eac152b9/tazudanakedirud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=unable+to+move+files+to+sd+card+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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 10852 bytes
SHA-256: 29d44ee481e97e24b0ed528e7d601935b1046003522ae192a2d0b57c182d4233
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 19536 bytes
SHA-256: 5d355a9d27ee199b4e9559f8c16a4f63670ffa290fcbb10353353774bfb19ebe
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1