Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee9b86eba3cdbe4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 12:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0446d306f1e06874e378f950139f462 SHA-1: 63e985f1c87309312fc502164190cf63424bdc47 SHA-256: 9ee9b86eba3cdbe481912eb76eaae6d726263e24f7c7280780e5c9125dc399f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple external URIs, including links to compromised CMS upload storage and a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=note+8+odin+mode PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614193b2600a5---monobevosazod.pdfIn PDF document text
    • http://infracsap.hu/files/file/31778728634.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7jl6isf8pjvmta14ihee8op618/fujuvufibefevegefezikeme.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/bedabozadiwufimipebafu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1f583014---33738809153.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/61475199945.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/61027419832.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/vixinenowif.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/56458112785.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vubakijovazajatosazamedez.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/80d3c986bb84000344f3fdc429ed8219/tapaxefet.pdfIn PDF document text
    • http://octvads.site/js/ckfinder/userfiles/files/lepovofuvetemedifa.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/2236687988.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/garatowosofoz.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/godiduralezivavozamo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302f781806d---27061131615.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kuzameke.pdfIn PDF document text
    • http://agama-rc.com/upload/files/9561578933.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/86628739603.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/28993490868.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/parenudapu.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/79086554330.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140102b95425---powetukaparive.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/vuzofajerakotofirepiwen.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/tipubumixawab.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/27438284852.pdfIn PDF document text
    • 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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10116 bytes
SHA-256: 043bfdd6c43f9df0ced52eaea8d4b0df0e4d54c63371787ebc83a8e6b2d40a38
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 18212 bytes
SHA-256: 44e06f7095ee5e6a120203522a736fcc6fa424adc1341bdb3b59bfdbb10c3f6f
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1