Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b756a8c6b4f8da…

MALICIOUS

PDF

81.0 KB Created: 2021-10-14 16:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 402a44a1918da5f347dc6dbb35c6a69c SHA-1: c66697bb37e52578353e41be5e946495b1b613fa SHA-256: d7b756a8c6b4f8dab8811f8f37a49b67c94e9286caa143b9e14b745f38eaa897
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to lure users into clicking these links, likely leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161511b3ca09d4---fovepemipininos.pdf In PDF document text
    • http://yansyuan.com/UserFiles/images/files/30862288913.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/selidegojivo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d0808737f26e442c2d3272f72b2e10eb/80840201449.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/fusalifogedide.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/97844785625.pdfIn PDF document text
    • http://land89.com/ckupload/files/xefedimixowinirokifutil.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/zulebobozuvutewimi.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/poluluxojatobi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v9apgh5d3fp05bev700s6i0cjs/4471071327.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/somewogukazemexokofapip.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb5c5716e5---burofiva.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/4209253392.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/71274787980.pdfIn PDF document text
    • http://unseretochter.ch/images/file/37864209951.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/95409552036.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/98259809349.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tijonemediwisoleru.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/vakidasiso.pdfIn PDF document text
    • http://schubert-hh.de/image/file/69326954540.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/64990053938.pdfIn PDF document text
    • https://e-room.co/userfiles/file/polomumefuzelup.pdfIn PDF document text
    • https://flomogroup.com/upload/files/ragulo.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/47226341872.pdfIn PDF document text
    • https://datajournonepal.org/files/19667609614.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/87962563956.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65034256782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=video+mov+to+mp4+converter+onlinePDF 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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 17176 bytes
SHA-256: 0788c056b0543b9c8003758d10a9b71d9cd2c466af5ca2ff596020c3c6fba558
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 10460 bytes
SHA-256: b4cf0538cd61da95f39c9b88f6cb296bb0a5b2320338dd51a820d90ddb83099c

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