Malicious PDF — malware analysis report

Static analysis result for SHA-256 2542ad10c6c25d81…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 20:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 268b569a25c0df2803dce7ebce4d8fbe SHA-1: c656921f5a6a48359c0db5924216a74f53b6f7db SHA-256: 2542ad10c6c25d8116f48ac82e9e966c0efb910750e8d4b46d21618aa10aa22d
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and presents a link farm pointing to various external websites, some hosted on compromised CMS uploads. The primary function appears to be directing users to potentially malicious or phishing content via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://webbuilders.com/files/file/64695662226.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9153897868.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/32823696292.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/piwimaviwubikoligudokemax.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e4f7b2823---37795360435.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/paworara.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6a5c403f21b66c69fddaf1029d9e1223/puvuzo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1rrv7vjmi8pjfovjic12cgoqa3/jakazivebari.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/nebojumonotawoxeko.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/36560598108.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gnqab0t27vosfgt7n4m4lvr214/natuzediguvotetotarifiraf.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/32976814117.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/pepizapetoj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161435d9610dfc---82570816874.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/vagoresiguto.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_F704098955DB50CD.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///rupisewofiluvetapokoz.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/30256190674.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16151238c492a0---bulisowopazijeki.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikunires.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/mojogujegisojadoxuzibaxet.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/giroxopomeguzokun.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/ponesuvakejujimujizuw.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/rasawewezarugavo.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/tebizesagek.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/3429473227.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/80963380573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+worksheets+on+active+and+passive+voice+with+answersPDF 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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 14464 bytes
SHA-256: 9388d7be41839420d3b1f487d7758a425844a28140146e639d7bbffa42b51bae
font_02_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10788 bytes
SHA-256: 02c755760389cb07193cec94e48b6d1bd4f52feab104e7578fd63a44d9b0f880

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