Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6ba25f59a962b0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 18:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c320472b5420bd5153dc26b83a2a18b5 SHA-1: ecf10664e032f0ff267375ec7c63274b8e02b517 SHA-256: 2b6ba25f59a962b0f2854744bb20fe980e5f2f9d9a778bbe94849dff9e18b6f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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 https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/mfsnjjaoapoglv41fjhl0f04vu/kubixemikodakoke.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094304325dcd---33618360531.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/29229550923.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/13856355161.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0b2c431a---23498829689.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/jupotijenidoj.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021781355235329.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/holne07br8m9mqqnolcahbtiq7/76532604634.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/371d9aeb40c6fcce52a4ef72917f923c/62673998545.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9sm3v1itfr1u94uhn53bj8v406/90312672797.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/siluvib.pdfIn PDF document text
    • https://auto826.com/uploads/files/40677811216.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16118a636b986a---vugirorewotudu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/59986190070.pdfIn PDF document text
    • https://advik.net/userfiles/file/21594352041.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/46969719138.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/kepigamipitokekaduja.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a5514c5c3---6443916440.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/54998602462.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/95055972614.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab34d0b540b---19466285531.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/qtfg6niibbrliju5jmrf6h1bt5/87963049277.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0df76e468---33077727965.pdfIn PDF document text
    • https://cncunse.com/d/files/reredi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ultimas+soledades+del+poeta+antonio+machado+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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 19920 bytes
SHA-256: f05f010572bf04cb8df11e2bd43e179015e6ad157604351577d3a49ce342ec55
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10792 bytes
SHA-256: c1c47c5829e877a9b606c4fb3b386745a225e6dee653965b45003221513ef4da

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