Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1be72f113fc83…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 12:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c663f9819ca1e93ee0746e1d21474603 SHA-1: 2a1441e56140cf4994d8d8c0f0af5fc2df132d10 SHA-256: ecb1be72f113fc830450879b2a8b72cfa7af52c46c20db32e145d8a586f24d2e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=show+phone+number+on+android PDF link annotation
    • http://computergramm.com/userfiles/file/93381331413.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/timulepafunuzedakazofu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///duwitowoniroredowomis.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/5051518065.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/96857231202.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/89577424535.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/pazefu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fuvufukovopemugozulo.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/22745792651.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/19206630101.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/ligurumavofazipuri.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/47407428930.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/nonagogubutizetise.pdfIn PDF document text
    • https://agatanorek.com/files/file/befedobisotumuwebegat.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/vujexanopefutedi.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/7222287137.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/siduxoxogibunoxigajubuxu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/50df9aae8ccafecf80600b424b428289/gutowebabufotorax.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/39625167207.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d3d952tqbihq059nmkrd2rhji3/tagumubunevumixiruvupoko.pdfIn PDF document text
    • http://crm333.com/documentos/file/kaxugonetemes.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137a468c3089---xalamonofimatogadubudi.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • http://seamacros.com/upload/file/lugativezamawokagulujidep.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/kogeromafufitaje.pdfIn PDF document text
    • 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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 17620 bytes
SHA-256: f552260761453e47321afdeb13203b5b0e551bedcf31dae7e3eea748cbb75481
font_01_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10748 bytes
SHA-256: 2ad8547cd918f00eb5297f09d8a03021ac11649e513235bdb4367609c7f959df
font_02_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.