Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacee176b437c54b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 02:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5c62af2cf5085c6ab9cf86cb060ee13a SHA-1: 46e4ba20d69589fb6112a29828f5ffc089819af3 SHA-256: dacee176b437c54bc65b18247c3665d93bea069374dab193bf0453edd8e62a3d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://protraderin.com/userfiles/file/62605400013.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ffe8626728aa3b6c80aa26aa49844664/tasilebuxagadavaxido.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/61181059852.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad9569482---56553824856.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/wugonebafigeroxowafesifes.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/62605945028.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/sovawem.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kupolixomasevobejanavigas.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/fimeleximize.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mevad.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/788aa00213c38405af55c43b8e6abfff/92609295318.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/908026dc2c58cd5438f40578695f1e1d/xexip.pdfIn PDF document text
    • https://lapakunited.com/contents/files/27239378096.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/44903149118.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/65904402035.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/fewunadikufod.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/jexalonuzikizifajerafis.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613872d21ac29---40602899101.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/9265809484.pdfIn PDF document text
    • http://winso.tw/userfiles/file/nikazim.pdfIn PDF document text
    • http://hopkim.vn/upload/files/43477859516.pdfIn PDF document text
    • http://rentaruedas.com/files/others/zawigujozunawimeb.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/42458955382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+gold+download+androidPDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 10504 bytes
SHA-256: ceca9e11cea347baadc227786d6c730f77b9d8b08547c4176999f5a0180b5c41
font_01_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 16064 bytes
SHA-256: dbc6692139b8b2a094457553c747c5ce9b89868138d20c77b514884a111f3173
font_02_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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