Malicious PDF — malware analysis report

Static analysis result for SHA-256 708461c11f9f9b7f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63c955a70ad8bda0ec68f74d6b730535 SHA-1: df886351a8242250078a7fcdf7396a624a64ec73 SHA-256: 708461c11f9f9b7f01422b8e0550425cb3312d19756d8061bf0125c1d2923c91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or further malware. The presence of embedded JavaScript indicates an intent to download and execute a second-stage payload or redirect the user to a malicious site.

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 http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/39213052018.pdf In PDF document text
    • http://gachbinhduong.com/upload/file/fizez.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/tiposeganapaxomate.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b79255a4d---famozaxejepekojowukafuluj.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/021735282921.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f0c5d4e---10559579889.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/kso03pp8dqq5uo3f1488t93o35/54827524096.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b44478da107dbe2b4068f7ceec34c39a/navazevoxabozezolimuvokew.pdfIn PDF document text
    • http://slsnn.ru/content/files/laledikokaxedupinedosasam.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/72d2587d343b1c6a899ebe7834004298/wiwerawebixas.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/32226887121.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/91657580636.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/30575243700.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/fijateranomutivegomalu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ac19bb6b4---zukudazuwurozemu.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210830_2260D16C9EB94EAC.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/52815559095.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/49639707862.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f97205b3---baxavezimumoxutisapukemi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f18kpb3chgo6ib4ga6hr1o5eeo/33495747520.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/15503601946.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/04138b75f40bd907c96eefaffecc57a7/65259020418.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feee8f9ffe7---pitulufima.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/20305051528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=present+tenses+intermediate+exercises+pdfPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 17772 bytes
SHA-256: 2eeba8d8cd398753777c504c91ef36fdf7f9f8785625f8feb6a4566e54e7daca
font_02_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 10720 bytes
SHA-256: 0ce7a5d46e954f69e9d264ba5f28f99dda5f3bdc7e757da554931bd5e564f5cb

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