Malicious PDF — malware analysis report

Static analysis result for SHA-256 c462ed97f5b1efd3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef1ec114376649d8b229890459756e94 SHA-1: 117a4e3fe76cf2015f8946fae0937042b4abdd22 SHA-256: c462ed97f5b1efd3924675c87a85cb89e7f30809fbb5480f6477cd7397575aaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47655f4f5---gezekarojuzumolotabozoli.pdf In PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/nafuzuzamalo.pdfIn PDF document text
    • https://eslms.com/userfiles/file/83473030873.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/69752996246.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/68124461478.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/semipu.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/zorofefodezufuxuwenebiro.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/63330149923.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/013bbecc19e012297b7f19f520987f9d/46252506910.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/tagozizadajetejigovuzuva.pdfIn PDF document text
    • https://superchills.com/userfiles/file/lidokejaguwimubinev.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kifuwujopegunit.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/megupupaxosajit.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/zasegejiduzinedegegesuwe.pdfIn PDF document text
    • https://masihpt2.com/contents/files/pulibase.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/29558751478.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308b028210f---wapixopifeg.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/lebevaxewegowifabebeba.pdfIn PDF document text
    • https://renault-service.com/userfiles/vutovixixajuwogidekiki.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/vavewinesakiri.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/60364354841.pdfIn PDF document text
    • http://dsraxys.com/uploads/81614116960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+frozen+free+onlinePDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 10316 bytes
SHA-256: 13627266ed9c8629c3f8f70173feaae3bd41ab467c9cf39db440598010a9311c
font_01_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 17808 bytes
SHA-256: 814d89661894f873cafd62e611e131230aa7086a91e8c870bfbdbfb4f3e35986
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1