Malicious PDF — malware analysis report

Static analysis result for SHA-256 b247c3c231d963c6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 00:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6a98c9353e3cc3791b1f3afd8e45725 SHA-1: fd8edd7e4c7c72f7e825d9cff3f27f3add6be402 SHA-256: b247c3c231d963c64c731435833f773bc1547ae5db2cfec6f40ef1fc509e96a8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links appear to form a link farm designed to redirect users to download pages, as indicated by the 'utm_term' parameter in some URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=painter+apk+download PDF link annotation
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaed8e250e52fc2460a1c085d4bbd9d8/80048216965.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fopupafati.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/82127665338.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-10/2109101254200263815krjw6eor5mw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337b5290f7---felozokuvorow.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/mafowemukurokofozod.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/852ede2f9e45f55bd80a282324169feb/15521598689.pdfIn PDF document text
    • https://signika.pl/Upload/file/82961622656.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c47f52ef8f983f851732aadc7be284a/nakukexe.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/funujepoxizuweluzeganek.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/moxadevevanubiwigexaj.pdfIn PDF document text
    • https://btegypt.com/file/35201103798.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/1849626700.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/32756790520.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfacabbd5---kobule.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/96003403226.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/62047790600.pdfIn PDF document text
    • http://briztravel.com/upload/files/xajalazobopawu.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/1211601880.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ca84fa9f4d5ad0da8468e3d24ae533e3/ripod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135072147655---pelulavarewulubid.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/mibezitabexelekup.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xabapilipesozenoxi.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10396 bytes
SHA-256: 178a4a4c1462af61b5a6172d7c0475ccb1414a1759ac4e4b564c8737f0ede64d
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 18484 bytes
SHA-256: a683c18eee64af4488ea403c5471b7b8e8fd30b022de85ae400292f0b4a3bcca

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