Malicious PDF — malware analysis report

Static analysis result for SHA-256 a283bed5ec3139a4…

MALICIOUS

PDF

85.9 KB Created: 2021-10-04 23:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4526348da8ca64dc925676fe5a706e9e SHA-1: 1720c7c2712d1cf2c592f26cb6489a831e738219 SHA-256: a283bed5ec3139a434e6fa434c5dff92331de99ecf4e247f3b939846401ba2f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm pointing to potentially compromised or disposable hosting. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://drafthe.ru/uplcv?utm_term=st+pauls+cathedral PDF link annotation
    • http://mardeestilos.es/fotos/file/26861559347.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/67704379851.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/noxovukunovoza.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///valoxezijawizulanilu.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/83900092733.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mupalobovezavinozetarob.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/vowigawodopexumaz.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/sikanibijatazatusivebuzul.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/luzuniwuxo.pdfIn PDF document text
    • http://dges.in/userfiles/file/18933510395.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/646330595.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_BE2FBFE6534863E0.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kusosaxofisudiw.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/eae18e6f59756e28be3678df4fa935f1/41675749566.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/63341520604.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/xepiniguvakanonis.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/54632314033.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/720c084b7419b593ac58ef35cde33610/7358876500.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/88336453167.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff9c7f14e---xutadelovafadepewenalone.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61720787386.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/46899252575.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/60015586500.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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10472 bytes
SHA-256: 2dc6ea830a15e72893e0bf485030abe2353cdd2dda36559712b53025a0d89a66
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 19128 bytes
SHA-256: 8a669931f29907ae7d7f1c1017069bd2f2fe0be7e391cc1189ba5769cd62cd72

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