Malicious PDF — malware analysis report

Static analysis result for SHA-256 676034e5edbb985a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 02:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f18b258f1cf96419907151ec61fe504 SHA-1: 5c1eb702cc2d3267baf412c44b4aea70b364e037 SHA-256: 676034e5edbb985aa74c0ae28952fcfb24f41356ab10c811515e72c52304a0aa
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to deliver a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of external URIs and a link farm points towards a phishing or malware distribution scheme. The primary goal appears to be directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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://club-sports.net/uploads/products/files/mozeles.pdf In PDF document text
    • http://pn-tech.net/userData/board/file/49733814336.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0902d255c---pufukisoz.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/13180894677.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/16bfc240fa6a32975d2c20d5c35e4509/kudidun.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cff42aec---wenemaxopugezagaravur.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/18331638865.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/10496229614.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tibusizijagofazobob.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a4e3e5b800693f7785a649f28a538e4b/1002031300.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3f1407b4947cd44596c2e104cdb9c9e2/68699503587.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/22dfbaa5a098aab9c9b9e620197d4160/dawaribire.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983caf22197---72751966209.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee8a51048---51532306907.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/77846338282.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/remipotekovupalagu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/mesajepiteva.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae3720e54---jorutitakebazatawamezed.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ebf9519c9---bubituseniserovazuvivora.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/3284290445.pdfIn PDF document text
    • http://agavietnam.com/img/files/nodabebamiruxisedafikipa.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/pikasedega.pdfIn PDF document text
    • http://fitviewer.de/files/file/21584797979.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50464204f1---wasuvaxomikak.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/40079564413.pdfIn PDF document text
    • https://medpressa.ru/files/file/11016385614.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc646e24d---51090334643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ppt+to+pdf+converter+zamzarPDF 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_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 17532 bytes
SHA-256: 9e0dbcc4211a505795940ee521ab343ecb019974429762cb24399a19f38b64b2
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10604 bytes
SHA-256: 448cb4f6e0140d8f4926298fa6a7913892da37bcdccfdd8423e2569c1c396e11

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