Malicious PDF — malware analysis report

Static analysis result for SHA-256 1353ee894587e600…

MALICIOUS

PDF

109.8 KB Created: 2021-09-16 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b50f587df3b071bd16682411271483d SHA-1: 858537244afb0e6707b40c623d2b47ea0bdae78d SHA-256: 1353ee894587e60089762813c05c9f9b19654f5842546b93409b973028eed99d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to mislead users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its malicious intent. No scripts were extracted, but the overall structure suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://upaspor.com/resimler/files/73923843045.pdf In PDF document text
    • http://halongwave.com/userfiles/file/77381688966.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79522803415.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wubekuzom.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/5040858428.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rogalugibofareveje.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/70454733006.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/93661285030.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d12d1e5b73fee9ca433b9dccd1b1a636/41378702398.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/kawidinukel.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/zefigurumafe.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/71133312724.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4145f4560b0f3d8e15557f66193462c1/mamanonazeruli.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/17729329636.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/lelonituraxifen.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/653165634.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/46083485727.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/fujedasexasamadipopasek.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/67643114721.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/80617265317.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/nebarani.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/740e1bcb4b55b0f9cbc93d95c0c87239/16682643805.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/wolomubesewu.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/53075258304.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69783257757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=electromagnetic+waves+with+longest+wavelengthPDF 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_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 19060 bytes
SHA-256: dea7d812434237b1ffc7cc2f98c11b3ba49623dce66e67dccf868920dc55cfeb
font_01_sfnt_off0001781a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781A 10812 bytes
SHA-256: 359ed8e1ccb3af95907e24eb31d011fd3023809565626f84d5e937b30780b9de
font_02_sfnt_off000190e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1