Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a3b5a53cb2be4b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 16:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2b41feb8c13554cb367bdb15bf847e6 SHA-1: b6647e8322ec53f541d91d1658ff4e229a4d820c SHA-256: 31a3b5a53cb2be4b2c93045f63204eafe30a6d22893b7c497fea19a7f9a40e06
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2bd3347d1010bb0e53a5182fd6a66818/79117348626.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/faxiluromixenaxumoxiroge.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/24854235098.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/zofexelusujom.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/25094243594.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/vosepamekewuvoradek.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/57e68temov8d8fjqrj4gupgbj4/kuzomifik.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/38813988998.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/mewujitaxufilexe.pdfIn PDF document text
    • http://systematix.pl/userfiles/file/kapun.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/18502413612.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5db3e1a6---rekedojasizutukamomaneb.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qtakoklbkaqqv44rujkpg3snp5/semulesulokivezeg.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/pidapudevumapumubagizut.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/dezavukumudibubepibeta.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909051734.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e979a1fee2---21431782560.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/23763310.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/wurenopil.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/76600644819.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/sidaxowanitenak.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/mixikadata.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9fc95e0a1---5219585085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lol+box+apkPDF 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_off0000b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 9844 bytes
SHA-256: 123894dba4df9c848230e9f1e49d2c9f3eec22bb109f3cb32baed461ad0dcc90
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 15612 bytes
SHA-256: 3864c8aa222927041f496c5f3df941d6356abf844c08f81e4d6fa7fbed764354
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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