Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dae6f91aba17072…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 09:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe2e6b9fd7cf145cbdb8d0aac65977be SHA-1: 6c84bbefbb56648c121b7db13cfba9710bef472d SHA-256: 0dae6f91aba1707232357fce4a9e38e05c09b34585be219502b8e9aea28563eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://runo34.ru/attachments/file/xazodosasuvutuvorukemeg.pdf In PDF document text
    • https://abbma.in/admin/uploads/file/walexetivuxa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff1cc7b67---91643251638.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/290fc92f7afe0447884cc9377a92c4b4/36660797753.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9bbc69e820c9e742e94deecb36ea6a5/vojuwisonizevovivabowu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff6a93caa5660e28912b04ea1517e7fd/nadonadig.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/14718420675.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a8880d8.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b9c1f8d9---49408452264.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efc3b38fbb---35516782461.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c54f540866---80883828640.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zawezisiw.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/13899250020.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ff3f0552---rifavokabanitemu.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/37843685408.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/44181e4458e86221cf859d6a037a660a/91541944736.pdfIn PDF document text
    • https://chp-travel.ir/data/file/ranotesawofiseje.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbebc800d7---44027089153.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/75177967544.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/xafalexesa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hitpfg9cspcaq7sr0qsgcqcgf0/kidasiwelexo.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/92936444217.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1c2ba2b2---befaduzesuk.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2acd0f9d0---2689018293.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a247e7ed993fdeece9cd8761048cb2ec/desomanisabeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=decibel+scale+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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10332 bytes
SHA-256: 071554840ac87983f33f3ee65c1d9cef4ee12fbce76d18a209055ef37e0f6f9b
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 17068 bytes
SHA-256: 588bd1d78cf77520f39f0d19c859568e086f11121de2e6cfd90029525c0c0b73
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1