Malicious PDF — malware analysis report

Static analysis result for SHA-256 97915c0a3ca51b47…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 23:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2069ec5c712337b47ad69cd68a785d70 SHA-1: 2c49ed5e5643dadeb41ee1626c466b98127e021e SHA-256: 97915c0a3ca51b47f5f460c105a34e4b791137ebc113f2a4a0459445cd0415a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marupyara.com/fotos/userfiles/file/44623300442.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/xezefovusomezelurigateb.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/38376769820.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/82559384353.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/zixumotijoludikidexik.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/91753079874.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148bde14f1eb---36764198804.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210923_2289E0949FCD5196.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/metixeb.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/22851563063.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/sesisatazimilib.pdfIn PDF document text
    • http://tradotel-riviera.com/file/janejajopo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf35777ce---72664188990.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42964158011.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/lazarajuxafukifutopuko.pdfIn PDF document text
    • http://elitacasa.it/images/file/gojowobukujidumojigakitu.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109052349264968.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6b09544c---95548756314.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/zirezigiburawisug.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/14209894657.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/36017825218.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/mawokejokazilimutugofa.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/51434623373.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kaferebijuturi.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/45645629083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=boost+mobile+apn+settings+for+androidPDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 11036 bytes
SHA-256: 4f469103c4ded2f49e5cd1712960664e14abfc8fcee2713ccd637540550770aa
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 17992 bytes
SHA-256: e162901c65ef7e88e4a3634eeac9d6f88d559527dc13ccad5dae39a58299440c
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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