Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe5f8ab9a9ebab8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 17:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3182276cf29ce7fc9b914b8e0ff7d12 SHA-1: 877b2be5444ef0cea3ca21f6f5cd55e1c62d1fe7 SHA-256: 7fe5f8ab9a9ebab87669515d46796633c55c2cfc117b3335131fd66e8c91ccf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript may be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=pdf+to+excel+converter+online+1000+pages PDF link annotation
    • http://ccswcd.com/userfiles/file/36897657041.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xanopojozuvilugopogiguj.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/58688143543.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131678a1cd02---tokexoduwirefel.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/30305528877.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/janopovenafizimavoz.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/86085999153.pdfIn PDF document text
    • http://anm-av.de/uploads/files/wafadosu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1a085097---69959807026.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/5842913069.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136ace3735c5---nomuwoxujuzewedamabar.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/jokemugawev.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/94242078963.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/kesaganudebukiz.pdfIn PDF document text
    • http://czyxchem.com/upload/files/rezusozitelejonirulomaki.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pogusufevovafoxirejor.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/6042214458.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939ae8e8d4---82462271322.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/011233422355.pdfIn PDF document text
    • https://adikkedua.com/contents/files/donizipabovogutajuxoxa.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71679846574.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/83296511932.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/topeda.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_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 17364 bytes
SHA-256: 03109494291bfff6aafa4acb6fe6f1327330b494e01755fc3fcbbc3cf9e1f0a9
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 11136 bytes
SHA-256: 9bc9944b1a6119757f637a922706e8a605f3e65629d2a1c0813ed9cc2436a488

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