Malicious PDF — malware analysis report

Static analysis result for SHA-256 c948b67adfd31cb2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad454700b06d2a22c9456c3c40260c19 SHA-1: 07e692e8a6394934bdabd457b68630b7eca65b5b SHA-256: c948b67adfd31cb23004f9d1db5f7afa2c5e929619404a4b380703446466dbf6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farm patterns, directing users to compromised WordPress uploads and other potentially malicious domains. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

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://oniceh.ru/uplcv?utm_term=the+piano+teacher+elfriede+jelinek+pdf PDF link annotation
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c5125a2d7700158ef61f9dc0fdab1b99/29569649366.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5iai42klal9f0rruhoh87r4nul/tojur.pdfIn PDF document text
    • https://matrixx.lu/images/tovototepivafigevalevek.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/267c243beb0c10f7404de697874bfefd/xomisewasedapijow.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/riwiduje.pdfIn PDF document text
    • http://gdgom.com/upload/file/210815094919013417whue78fk6s0y.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2b7fb8a7be4d521da16189a1d1457e87/ravejexenos.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/78de8befa72cd8f47e5153319186b591/malegazanufigumusafut.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gasqp8osjtnm2knj5j2qoa6g84/17653394448.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/38314558163.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160843d8701b0c---vubaniw.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/36071511718.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1a842e56---sukapubumurobofo.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/patikewomawezewaxurododuv.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec699851---rusomisewage.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/rakugeka.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108281308152472.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05ef2a558c7607327d1534640ba4dc2e/97376005415.pdfIn PDF document text
    • http://caramelitos.sk/files/50005037317.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4453f5f9fa31dd4ceaf79e5eea16cd67/48373683163.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41979420303.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9a9b7b726afc7af3ca206e4810ccdd1/32248892045.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10736 bytes
SHA-256: 93c17e89a065b051b18848c1dea3dbfa1842054d76355d8f5760d66ffb84f750
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 18828 bytes
SHA-256: 4927457f250a454339c14a4b975cb778de8e019e229c03742abf731127b9fcac
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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