Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70e8d74d593b1b8…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 15:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d5d1142739911cf2c19a1ea6ba2df673 SHA-1: 61716c482e6110ade23d903b7c82c9bce2028f4f SHA-256: f70e8d74d593b1b8a7569dae78dfe11f6fa0f6ccb695c136303097d3657a936f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious, and the structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f5ba62012be642ddccf9319f743ab3e3/zawusaxonenekupeludifepaj.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22531c5356---wejigasiditagid.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/820016fc71834518c0f0f89007c2e8ae/54287291197.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f8l2jpoeudf6vu8j2krea65ld1/7190567462.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1ma03qbssu7op09tdfagadqq7n/kuremukopigunevirotonamor.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lulorutezejazorunukimatur.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f8f4ca65be65d5fd9d1fc694b318ac21/41344228890.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/jofutuwifoludakazosowuso.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4831ef1a50---lasuvipaki.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/38373263805.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/rulabunasuse.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/60528834282.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/13d1a98767d71f55b5182fe8bcfb7529/sevemo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1be7aecc---tajexosekowiwixeku.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d7261038---22018519218.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ce7c8c73f224a0ca5447df6ae36fee92/6745691363.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/672838e121d526f492a394c039ccf57b/70267670369.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/79922900049.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zofuzujesomexolimimij.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb979d2bfe---matadisafe.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/tewutedaroletuwibej.pdfIn PDF document text
    • https://medtek.vn/storage/file/duvopurobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+level+is+the+best+to+find+diamonds+in+minecraftPDF 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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 17988 bytes
SHA-256: 9edce1a226008feda2879d165fbced3664cc8ec2e60d02f8454970ecf2338283
font_01_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 10940 bytes
SHA-256: 221b218633e473a5278bca6df6a7222942e06f53c731c8d6a76e5a5b4febd12e