Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab24d3a213d89678…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 08:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1f08628e07f905e1f91cee7438acc5f SHA-1: f0fcde99ee2dd81870fdfa2aff9c97dc1cefe439 SHA-256: ab24d3a213d89678c4f1c5985d5fb802f5803825fab8061286744a37a496df58
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs and a link farm heuristic suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://medob.org/SITE/files/editor/file/32431532816.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/7281872733.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vawege.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/54873749879.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/11850929319.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b21d2b2c1---fokazigup.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624443031.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/4568741557.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608db30e1f888---49412604740.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098fc9877ecb---48116654883.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9c20ce744---dodoguwatipavuxu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d79438a5---61862289408.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/60282777426d5c6166239888d7771742/gopafawux.pdfIn PDF document text
    • http://ore-processing.ru/d/files/kewaxodewupupup.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/crk1opvjnl2tue0oiovgi9r09r/74240920874.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/xomejuwidupebizeb.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35959d251---57784590862.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dikitufabekozebikag.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/49743121853.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086415b545ca---kopul.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f39e2171---84926131688.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/anhueeln73i25auini953o0v92/84778815525.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c1536b9---64326277223.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/unsikdkstfs68dtfs9miog126u/lebukinimaravuzaruvuz.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/benosuviforosalamemopoje.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/19578513558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=anchoring+script+in+marathi+for+school+gathering+pdfPDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 18200 bytes
SHA-256: 0dfef5c28143388f7100c5daad8c4ceb755b56aba9df04c0c2b762881a8cec50
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 11048 bytes
SHA-256: 1a7d73bebb907cb62f9e71437791fed68148781922563904c6005641b74e5d1c
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1