Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e255c3fdd93ba1…

MALICIOUS

PDF

75.9 KB Created: 2021-07-03 07:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8d8ce23a130a98cce8f2e7f417332b1 SHA-1: 84e9e3ca1eae4ecd2c0e6b9e94b0896fd49dc1c0 SHA-256: 65e255c3fdd93ba1a658276308badc3995456e1c85a5490b589cefe4a782869c
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress sites. The document body is unreadable, but the presence of numerous external URIs, many hosted on compromised CMS platforms, suggests a phishing or malware distribution attempt. The sample leverages multiple distinct hosts, indicating a broad effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/863caf9acffd24c029590c6b83fb2260/pewinumixelirekax.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bff9dd6e8---peparuxejakobigob.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/megikusetaxojikosufi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0fe343b1e22a8bdacb06856ff2671ae9/74727831306.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f269c465e5dd72c7ae6351503a9195f0/63413952294.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609712a16ff4f---janabasel.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb77c7d0ee0---87351857136.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/61065061968.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/riribol.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c57a02ae8---91672073025.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/906fdd28914451cfc4e1c7ece6abff7d/12440987884.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/metuloja.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/komiraxakukimis.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/013391ed6f80ca4db470cd044ee1aafe/776121448.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a47057e5278d988b975aba2f686a8ca1/raniwup.pdfIn PDF document text
    • http://funperm.ru/content/file/20903477801.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/5faatgs7c9gqpht9q49k1f91tk/17322999839.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjauco748h6p5dvc3cvtg5s00m/87209995101.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/oguftsda0i46n9jft5kq5u3u04/43167447140.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22bc72d6d---giduzanimuwo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae4c2638403d398d418b29f06b27f2cc/fisoxanelugoxifu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/58956086454.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e93fec084---kojemizikikexonozotuzon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nail+shop+on+43rdPDF 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_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 10484 bytes
SHA-256: 2b39ed7a9f1e32ba9a5ff4af2f0d89f9a599dc1407683ef4e651cb689afdb709
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 16996 bytes
SHA-256: d27693b1cfbf04b3b2817a03db1c2d7f70e9328597340ba014783684e5f3de36
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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