Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b7e91249580009…

MALICIOUS

PDF

106.1 KB Created: 2021-09-04 04:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf2dc5df243dd807be030755fc2dd8b2 SHA-1: 06874568f7eb1ed1ce42efcd64f01ff1d3820c09 SHA-256: b5b7e91249580009edb2659563d90783d82e4e0b2d0f990eb693dc04201f1834
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://absolutelyneon.com/userfiles/file/59307032594.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/rodewatokulirukizopeta.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dugukadisavore.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/89806510537.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/jexakapo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/dawevamefi.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/soninekajuvopenuriguda.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e8c7a8b3---titux.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/gepodapak.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d4c215aa4---40175464723.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/33350316388.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/tuponave.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/36843312465.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/772ff2fbf7fedf800864c745a440d271/bajededawirojipolapulogox.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/63222536473.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/73081729015.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/247286232996d5695cd69b8dd22a8d51/riwokodogekiguxoxir.pdfIn PDF document text
    • http://yulintimber.cn/d/files/sokasizatuwibikeduse.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/66483612320.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcblhlsomeg46rpabkb5euur1o/sekitusazomajodudatof.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/61069969589.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/8174172681.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/45690860611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sym+xs+125+motorcycle+manualPDF 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_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 10996 bytes
SHA-256: 87bd424b016fb788ee4f8790d21488a8b89750f3b43e612509dd5d322eb0f82c
font_01_sfnt_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001677e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677E 19340 bytes
SHA-256: 179760ef92c8c4c73ec6fcaaaaef337ddb7953c4d87a063141162e63de6eae2a