Malicious PDF — malware analysis report

Static analysis result for SHA-256 74166f9122fc5ec1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 025e58054b707a2f239deb862812b520 SHA-1: 016dd7bec48a544edbe81aef8eec8fb0fbd9c9ea SHA-256: 74166f9122fc5ec1ee0957465a00a59120c5b92d9536af63f0cec9566afeca09
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it is designed to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=narcolepsy+and+hypersomnia PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435650b6df---vabebarewemodil.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9ab6fef6---narilovokipebagenozawiren.pdfIn PDF document text
    • http://aimic.com/userfiles/file/97603359851.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6bac3c74---mozusekegidusigaralonop.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/95993733722.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/9280331597.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd880d4a8ad661d2dbfe11e973b24977/25406067004.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3677f3663ceb5ca9175270a98ed6242d/xobazitoti.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/gudci39ee3ga5ore9gart21ebq/88555295895.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d0093e7e48be367a12c71fa6389e754f/63893229274.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/tekagejekelidirid.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074caa277da9---62589285730.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8bab0ba64f04532037b27cf607c7d655/62893684748.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/fajobu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe01f41d79---wokipigivomisota.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a979a3f50a---jojadadomazediresabu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/sigujikavimofisitawidad.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/noguzofakujopemiviloxi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842715d9123---dunokerewok.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/kuvatiwakezikozavowiga.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607985380cbf2---kirizunudemoremedasan.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/p30kuv1j4tduqrviqaksnof04t/92143156752.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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 10772 bytes
SHA-256: dc5ae43c0a86940ba6a921a93184d3592395d09133c932c61fa950e29f755fac
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16656 bytes
SHA-256: a117767a93a9b5e4fcaef0794769b23a811c5efc7893cf906bec9ab57c668385
font_02_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1