Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dd32e68bbea6b6…

MALICIOUS

PDF

92.9 KB Created: 2021-09-19 10:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1376f1a3c5c96fa37b69553c5fbe0404 SHA-1: a05a5842b0a2e826f62edf9370d7cc0320022acb SHA-256: d0dd32e68bbea6b699491dd994de40a9faec17c44f328e280207fd5b0f849426
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on potentially compromised or disposable domains. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security controls and execute malicious commands. This suggests the document is designed to exploit vulnerabilities or trick the user into downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mekongtransport.com/upload/userfiles/files/jawugotogenel.pdf In PDF document text
    • http://jncs.kr/page_data/file/20210909173312.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4b64a01f---govogili.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/tezalukomiv.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/bujotubi.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/piginozefegigogukevem.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/satupukefusagore.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9c7763477009a191a3d9b4f6034558b/67474518683.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/24336518235.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/nuvofupanalefofigixuwonel.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/40405924694.pdfIn PDF document text
    • http://belniig.by/public/file/xubinerolumema.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/minerudazulikatas.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210909151237_3bpdng.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee40a95ec---73618944613.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a124d50d3---guwaruvewokakedirapewid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4016b61eafbbab4bda770bc2f1a1241c/dorubitowopidurajunino.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/38108713134.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905091822558842.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/2095298584.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/12768427811.pdfIn PDF document text
    • http://cudicio.it/images/file/79633358403.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16315448327da8e5ed4f7a6ea4c8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+screenshot+android+10PDF 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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10672 bytes
SHA-256: d5131d227ad4282b9e00e869115ba6e348b2d3edf39d6329730025da9b63e6eb
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 19764 bytes
SHA-256: 1a9b19824259683d2cc6e3fc90b0f232d81748b539a39adbdb6f7983993c3ae8

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