Malicious PDF — malware analysis report

Static analysis result for SHA-256 685da8ec1ba6755a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 18:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 873910133dc32fdadae6eb3bfec598c1 SHA-1: 9584ca0c53ebbf2cd775e890648ec981ecf50577 SHA-256: 685da8ec1ba6755a63fe4bf193b8e44fb4d9a6e3e590545082520fafb7d19d86
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=convert+doc+file+to+pdf+in+java PDF link annotation
    • https://kabelkyaobuv.sk/editor_uploads/files/49510499121.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210831081528.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/wejigilijijib.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/22573054362.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a508d4b1cf---6703177669.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f3b01f3481dea7106a86fdf7f6a23c15/jagow.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/038a6e65154cbb7ef905828cbe6a7d8b/85063665765.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/18b6tkb10a5a34t2ukl6gkspre/30281411645.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c428e130af8---5548527259.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0c7d2d61fba3b87334f444b37001f70a/pizewala.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/mebajetawabafakerujirir.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e08fe7c6d9---retafubesiferunumilivuruk.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubo9mlf7pgd6kj761bfik7i9f1/vuserelijikosamefesiwata.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/57213895461.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d01d4b0ae---86407096838.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mugozoxujumedukurasidaf.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/tizebusezixazokivovowas.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/senuvukiligesabejani.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/pukunonezi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8d2ec741f---82998722675.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/batanume.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cb9e8967---zivosidusediserupuz.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/39748562151.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dfe81d97a56338baf132a068ed9a00d8/zisafomol.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 17916 bytes
SHA-256: d12f6682634500b1066176864fc4741f6b8186138f72fdb4e6af8b756a57bb0c
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 10672 bytes
SHA-256: 6f1a384258fe12d719a1a67b3f32bb3ffebb580acbaf7c598d7d725ff434c78e
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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