Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed2ca6742544571…

MALICIOUS

PDF

79.8 KB Created: 2021-07-23 09:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8702b459105533d116cda403b2653610 SHA-1: a9c0ea5044a10eaff134cfdb93bc63daa946b4b7 SHA-256: 8ed2ca67425445713a7a90d88b2a7cde8f749a6f617bd119edf6908ad2a1ac2e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious PDF files suggests an attempt to distribute further content or manipulate search engine results. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/eb1176d2b889ec0610c2777d021a3455/dilas.pdf In PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zamusapazowese.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303fabdd39---bodowikofu.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/dffb231df49dc2fb876f43950434dddf/30995410270.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4ae4c812---48440966540.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f181579f---gupak.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efa40f713---keriwewaziravawomalu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/samix.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/99522162760.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zetubejexusisoruf.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095641c40f21---fifarofo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/db8a1d6b0b4ffac1b82fb455c2b407e1/nowiwidesasuwoguluridad.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///24195358791.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c9pgi4a7cvioaskddds985iqd0/rarujetusaxudifexidano.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/vafaguriwurebenumisolif.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/parapilu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c50878520---potekixisigiwukuzop.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/47899616278.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/91401b49f23d9575e59992dcfb5a5d34/buzowux.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vagivunetenodox.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799a8c0d89c---mafuxokegiviban.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/52561658269.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e0fbf7ee---nigekekuwabuzogepubegoji.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tv74e9jgldgmjt7bq3e1clq4t0/risav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bill+starr+the+strongest+shall+survivePDF 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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 10608 bytes
SHA-256: a00db416dc3fe9d98f16b7b50163eca619b9b89253112edd6b34c3bcc3e70b72
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16348 bytes
SHA-256: 694fd81aa444c3bd253d87d6eb754b8443ca658529de0134c062e8f53cababb0

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