Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d254a77685b4c2d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 10:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f87db6f71ac65b11aff9b23c3153e2ac SHA-1: 02956317a9f72857047383a7e867c263ea682315 SHA-256: 7d254a77685b4c2dddf4457c606dcfb58daad5a0791255c9f05778f05d62044a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm for malicious purposes. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://telesson.net/_UploadFile/Images/file/41783657699.pdf In PDF document text
    • http://epoch-making.jp/js/upload/files/9852543900.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jubitetojiw.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89604216497.pdfIn PDF document text
    • https://12waktu.com/contents/files/11256718613.pdfIn PDF document text
    • https://path.mn/userfiles/files/pavubukivitodazebe.pdfIn PDF document text
    • http://anpo.vn/upload/files/lajixarafobobisig.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8dc353ca0---xivuzadu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/78365363178.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/92661074667.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/fimavazigedewogeku.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/jagonebazezapugu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2dfca31ce---4800575359.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/62665649633.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/ranigisamupisukut.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1b476030b223daf68c61551e2c52cfc9/19740211648.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6e8643d9---71680287191.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/fivolob.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0676addbf---levegidorotutekigepuzaxus.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/tadidajemu.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/dapeverumuw.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nanidizam.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/68685916358.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xixugibomexigara.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/misutazufilenafidazuboj.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nagugupugevoxetodufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=easy+pattern+lock+imagesPDF 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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 16984 bytes
SHA-256: 35248c93d4193a939367ac7b68bbc62320c8e51d7c2454bab60cb46e165cbb96
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10908 bytes
SHA-256: 9099de4964bbf87af835dc0e39fbd433b791ddc6c29ad3726d7a1c2a95c9f09f
font_02_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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