Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b66f4c07247e33…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 06:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfc2f421269541de0427ba3dad5e52eb SHA-1: 2821410f0a403d5cf90e6a3e2d3635526a78a45b SHA-256: f1b66f4c07247e3368c3305c6dc42531ba2f653f8afb32a80a22d8edc02ce007
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.ijestr.com/ckfinder/userfiles/files/kisizerur.pdf In PDF document text
    • http://citescolairedeledit.com/include/file/koxivilesunetobivakeval.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/luvufewab.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0253ef3ef225a83fd06409e1d6e9dfa2/kiwajenefodajodonuwonu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/xojitinuwodevibimonod.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/pozudopajodusewo.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/53943280625.pdfIn PDF document text
    • https://iword.de/userfiles/file/41609632887.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52654132203.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902125809.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f156912381---selekifadil.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/ladob.pdfIn PDF document text
    • http://netart.hu/userfiles/file/lunuparesaxerawusalo.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/rabekimafe.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/68806752256.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/bafaluzavogejote.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/27246120372.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346644de1a---noradurilun.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/puduzikawerisun.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nurugugiverutujejumeruf.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/96222966205.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xijijaronefizawizobafudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+tablet+internet+through+usbPDF 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 17924 bytes
SHA-256: 7a34b3dbae6cae830034d92e4a3e6c8a379f9728a52c67af382b49febd76bcec
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10748 bytes
SHA-256: 4892f4f6ac21379e3b5d5a9adda8d21adb5ed5ac5843689bc95025b734768e8d
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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