Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e037fc3dcb1a39…

MALICIOUS

PDF

97.0 KB Created: 2021-09-07 02:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 167702afa640108d57cddd6f8fbb88a4 SHA-1: 9f7f8ebeffca79500d987c2bcbfde3d65d50f55f SHA-256: e6e037fc3dcb1a393c8e6f2d59c32bb73c1feb51398bbd3ea6cd47a75d9c5e62
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to download further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://funbugs.ie/files/file/sasatipu.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ciem7atc7aeq88t5h5sv1vib6/71448145688.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f580ab567e7a3ea6daf361181b5d0f5f/71300001610.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0b3b7583---zogopovofitonu.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094c32dde752---5227564966.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/pavel.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/zitijajomarewisu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf416ae54b---kejiviwadoremeduzun.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/30016226939.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nndrq4n90od6aoeu0ph73ck40e/39846086316.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44147a9b7d---82622635586.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c60ec453a5bb0999284f65783aade803/sasogomoposaxuzotaseja.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5794a6c1b1---62135084915.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/30493456215.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e8ff1e64e4db4f5aa82252d50769bf53/68631069863.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/76179975774.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0276d66b1---22261199757.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/53617202521.pdfIn PDF document text
    • http://domplus.su/userfiles/files/55810419844.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/56619777523.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210513003352.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c41eabaaa---kojimidugeg.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nisupisin.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6f9081469dec73acdce2f10b565db2a4/69439953261.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bdc2efc3---mepomuxuluxodimas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wd+elements+8tb+manualPDF 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_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10540 bytes
SHA-256: 084ffa841f8c7c99ab296d6a58be7b6067e1dd7374eb578b7aca7e8dfd1a1f15
font_01_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 19264 bytes
SHA-256: 6b0a64844cd53f3f3549827239e7938dad75e10dc5ecf48d76f9a7a849f4762a
font_02_sfnt_off00015e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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