Malicious PDF — malware analysis report

Static analysis result for SHA-256 7640e3d0375cebf6…

MALICIOUS

PDF

76.4 KB Created: 2021-07-21 08:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9b510d911307770b3e92250e0ac93731 SHA-1: 349371e583944dac098402daa964ffbc389bedc3 SHA-256: 7640e3d0375cebf6ba2dacde2bb2246a7a2d1c25faf4a3c8d889d2ff4ab5b0e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, some of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to manipulate search engine results to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thefencedocumentary.com/adminfiles/file/89682783029.pdf In PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/13852933680.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06df214cad---fotuwizudefemokuf.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/26906035112.pdfIn PDF document text
    • https://songhong.info/userfiles/file/sudiso.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/off6p2vlgmu6af157tt3078rir/87359853996.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d4c2ded7f70d26b6b0718b917e54a10/mavijezuxezuwabopesuvut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cd395b1a0cf14af4896d0adce79124cd/vusezonojupisakenugutafug.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f33eface4227783ed1b4c88f89682c22/pajoverasiwumulubodukibe.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/mapetikolenisovilujut.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/cfa1525176eda83a4f5b3078a058586c/87986186552.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/2fs40cd8vj989husqislllj1b3/72668357014.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14911766723.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f4dcd78f6f604357b775707122e7c87f/37989314100.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g7tkl31h1r5t8l57h5mhrsde34/pujefagelixetuxopomexo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c6b4e2a423681cc647d9654cb23484b1/widezegilemudow.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/16892923985.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/9605586734.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c28a8a957---lofelugavigugupekufosiwum.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/45540794316.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/51324722365.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb739abbfe---9436790887.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vazumojiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=castle+bayview+resort+%26+spaPDF 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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 17024 bytes
SHA-256: 921449be4787261f5aee7fcc5aaf327269c437d13a4950c018d6fcba4264248b
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 10432 bytes
SHA-256: f6839584b6d279318ac14e67efb08c8cf7d1bb1431fd3eafd19679e0261a1e18
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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