Malicious PDF — malware analysis report

Static analysis result for SHA-256 6385c87ecadd80ac…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 08:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4aec066ede1bc250cbad8829d6577e30 SHA-1: 124db8bcd25a59e82673ae5ce56ff943098226e8 SHA-256: 6385c87ecadd80ac057c4294282eebe3cf57f21740513494fabd679751849fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of these links suggests the primary purpose is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aloisiquadri.it/userfiles/files/38743156188.pdf In PDF document text
    • https://pepsima.biz/files/file/migopuzefetamusa.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/32025518027.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd0370282---nigekazajokagenifegas.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/bolifova.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/panilapajitugifotinid.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/31449573650.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6d10bd20---25296821162.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/90512906428.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/lafozelikejepudeduk.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/28095501755.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/sinatewovojiriboxek.pdfIn PDF document text
    • http://vit-physio.de/file/51038441932.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/70177334899.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/77240849094.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/vumamelomijamo.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vinovenar.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/viwokesijupasederiw.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/22fc284a431cf3f19125b1e355df802c/14992665892.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jokomorufese.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/46253219212.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b2488550---pumigibeturemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zooba+mod+apk+unlimited+money+and+gemsPDF 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11044 bytes
SHA-256: e694d14b17062172177e23a7c526cc3c36d1ea24991d2d9e89f0ad02ad88832f
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 17788 bytes
SHA-256: 02ccae15dab8e8b5d55c1c281297568b520ee2a058484a31c15d6c50753296ac