Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de762b13bfc3ffb…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 00:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5a74fd7e75608169fb3a9bf595ff2d3 SHA-1: 9f7c3eb1f1907cbe2f535aa8254e318aae78181f SHA-256: 7de762b13bfc3ffbcb9f9c772022469d7f535503928e211393a89557f0299623
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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://ketchas.ru/uplcv?utm_term=moto+x4m+game PDF link annotation
    • https://nstyapi.com/resimler/files/96219167154.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e456b8b66---55593986760.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/navasup.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/misixoka.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409c76bc0ac---99309312446.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/6854831302.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/8193769490.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/suwawamizigobetax.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jabexis.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/94953248580.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/muwanajav.pdfIn PDF document text
    • https://clubon.top/uploads/files/varogomoxajiputovafa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d2ff0c76---nivumobubutijovin.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/72093047738.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuzuzobexurunuxaxeru.pdfIn PDF document text
    • http://taigesw.com/upload/files/30417182412.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pepis.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc380240e9---lobojanaxone.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd4c7934a7bf55dd00aa3567d33abcea/35603224937.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nogosuvu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/83430013594.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vuvatgphr669vltug07dfjcks7/xokikopewugorugewaj.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/bodobeselarufiz.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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 17704 bytes
SHA-256: 5671f47dcdfe271f515dff9be78e023e831c5062a63126bf792a3f2aeb8f4781
font_01_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 10112 bytes
SHA-256: 6990e56f807cfd88c8367d1b81360369cdf57c70f73b1d8a77f7e0c22c8531f9
font_02_sfnt_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1