Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8707b87fc63fdd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 15:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75b0c35b391bf9e7d7e816e20ced9300 SHA-1: 09784d423b7082c851416c68586fe6346f829b38 SHA-256: 3f8707b87fc63fddca8161ebb4b5ee6c41eeaf716970161f0ae663d664713058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic firing and ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded URLs, such as the one containing 'pokemon+tournament+game+download+for+android', indicate a lure to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=pokemon+tournament+game+download+for+android PDF link annotation
    • http://ambvetfanini.eu/userfiles/files/zigalanijolopujuwubasizub.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3428451b7---35669642851.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/24745471646.pdfIn PDF document text
    • http://samtekelektrik.com/files/89919797054.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b80d18984---lexaxokujusop.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/56686439780.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/23236543599.pdfIn PDF document text
    • https://hinaweb.com/upload/file/91024564602.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/55106858453.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/texubo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fdd22c5df9acddebee3d85cac8a74e71/fonow.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/sigefon.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210923194628.pdfIn PDF document text
    • http://annabarons.lv/files/files/repepipuwalufuredubi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/suxepab.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/32107717269.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/16311958217.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/46046577513.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/fedorudosarizorewo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3a2918967bd0cb77448b2d953e93ff47/famotiwexodadinivajo.pdfIn PDF document text
    • http://balone.net/_upload/file///65950912778.pdfIn PDF document text
    • http://vucert.vn/uploads/files/51578874990.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a44068009c---96250099706.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/fepegasuxakidodonujapak.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/xoselevogilowodu.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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 10808 bytes
SHA-256: 4bf5e917f8561c6014121ac4b98aa7a3bbc65ad7c65842a67a3854fd3b724dc0
font_01_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 15764 bytes
SHA-256: 335dd76d172a1dfb7be6f78fa7ac8d5cde48b15a5117535ea48dd9583a9bd90e

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