Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdf6e7aea5f2691…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 04:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c664cca3c8f2712fc906bd251b4f3133 SHA-1: d019275ff59272476d3e2ebf04214cd8b9e2c55c SHA-256: 5cdf6e7aea5f2691c7af4e7222f08da9cbfc9ef93d419b24ba0d3d9d435ea58f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content or download further payloads. The presence of these links and the embedded script strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141210f6cd4e---mapefole.pdf In PDF document text
    • https://weeb.nu/userfiles/file/finig.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613040eb835ac---rilemajomegogefi.pdfIn PDF document text
    • http://darstin.com/userfiles/files/82815502514.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/46258098154.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/35120344574.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb6f2df27---33878322830.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/35757121647.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/piguradipudizuwujor.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/68256778966.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/67260041508.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/11933778428.pdfIn PDF document text
    • http://proart.by/media/file/55337130020.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/tunilamavolatakagulopeg.pdfIn PDF document text
    • http://donghotam.com/luutru/files/rijutowemi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fijibirizimugakazifigosud.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/50027247345.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/59573179147.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b42b10875a3d48b82af2a6894dea8eea/41906930330.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/50386840603.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/87249339099.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bofejegozoxujola.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/98733347134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2k21+mobile+codesPDF 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_off0000c479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC479 10376 bytes
SHA-256: b164b2582edcd01f7daaec6b66a36a8cdf0bba765eac54f701f9b56d47885554
font_01_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 18216 bytes
SHA-256: d6b793e6adb72bf5c4e9654fffe8066bf04559a9f33f50d3203db4411f11ea50
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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