Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d87e663801f0cae…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 01:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6a6499fa4f596f4176fb78d9dd8b421 SHA-1: 7296dc95f1ca200b7a99d69d04cf7f36fe3513a9 SHA-256: 4d87e663801f0caed71b1d7fdd1b5f18cbd86f781a855fffc1144dff58b7c28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the final destination by using multiple layers of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://holidayservicemarsala.it/userfiles/files/38022949856.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06bb3fb4a---67298817398.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/53710975753.pdfIn PDF document text
    • http://christopherdallo.com/file/kalor.pdfIn PDF document text
    • https://xistenze.com/files/files/teverewexevebezekik.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/mesonavukux.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/vafunoxokufunive.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/asn19uic01jhoq1e82nug3tht2/jutad.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4b292f1764de3c10b6bc7462d0948983/faxekamafomilobosela.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/82429635780.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/43140231341.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100097b44aa3---tivijokida.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160befd36e65dc---54855371622.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8k0o6kjihc2e6rtqi7qtqi8tbp/nudinonave.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/lukogunelu.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/soretegidijeropadagig.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/74277750236.pdfIn PDF document text
    • https://sinarwaja.com/account/files/risewurigutexipekuwuvoj.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b94001490f58b32c3d80861525105945/vitidakufotadujatemen.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9411ac351325b6c904f5835e39ba3d78/2360464534.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e588db6366---43380285147.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/14183483616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pulmonary+embolism+article+pdfPDF 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_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 17896 bytes
SHA-256: 9d31ee5d3b457990aa25fd6581b706f4d7de956c5275b6b2b9a6ac2fe389b46d
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 11136 bytes
SHA-256: 3ecc850c00dee148f9d7a43cb171de99df183a764c9472235a0fc4d72f1efa57
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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