Malicious PDF — malware analysis report

Static analysis result for SHA-256 817bd67e462c1588…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 10:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb260fa0276e0ef1e61b56c30ecbe10a SHA-1: 232200dfba4498759228e18350eedd650e018284 SHA-256: 817bd67e462c15882caeaca94df5ee2b0858b6c13eb25ddd6ad33da475d00ee5
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting an attempt to deliver a malicious payload or redirect to a phishing page. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common social engineering tactic. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://havanic.com/cache/fck_files/file/toralukajipuraw.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/98bcce6b42f02c9988ee92abd44b9a62/37720906612.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/51db0eec28798d791fc35f5343ff7518/64404005465.pdfIn PDF document text
    • https://tepihtrava.rs//files/25812428839.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210708072058.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a93d4cb623ce4e6c998384957997abdc/rarobima.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fab91007---vekinejusoj.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/62243879913.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160950dea09b32---majitorisuritixaja.pdfIn PDF document text
    • http://614move.com/clients/4890/File/611585630.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39879533ef6f96ee2ffade713b9a2fa9/lawubekaj.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gobamojevebivagafu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/75711566e9f0cfada93928b52d32d700/28538851062.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/bafojojubanisesijeno.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c153577551---rotajobikavomarixikezu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9d51c71e---mefalijuxenaruluv.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/delida.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e8550e0ea15580f659379240e2fa2fc8/pibelaporikigorubid.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/podowivimisivam.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/97107208969.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/01478a95405537ac7f7490931a09b1cc/fulunufirowirazuzoti.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a460f89c07f193ada5bfa8f8e9893ca2/xozuwofapep.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/mobejokegelopabibinugemol.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9hdpjps627o0bkq6sm6eo63c7/xexapusalelilomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=save+as+word+to+pdf+software+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16468 bytes
SHA-256: e60d4a6a155bcb9783e2cf246a48f58bf6cbc7bc29641177401952c3ba46bd0e
font_03_sfnt_off00014240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14240 10628 bytes
SHA-256: 7a22ed14482f25e1508c669b8526f76fd855d0f446e1619a92b7963f39eec684