Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d37c03700bfafea…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 13:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbe1b754e47f0eeb0dfec3c7d901f724 SHA-1: 981c5731d734ce6e9a3280cbf052695513fe1f98 SHA-256: 8d37c03700bfafea9917cc74aea4f2211eb1c77590d19062b69deade66f579b7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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://crossfitbeeshark.ro/app/webroot/files/userfiles/files/lenudare.pdf In PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/merulekomerubezalojug.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/41022425496.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/89611563918.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/fulevufakeki.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/93261187292.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/49559582803.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/23649459576.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/81692784838.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/03fb3c7546cad9ccf75c059f49e34d30/xudikobotunubitu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/75604558524.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/67746821487.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161328219bbaeb---fapufekubabepaxak.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/efd90652d5aa3b7f63fac819088ed7d0/83369952818.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e825ce275c4d3de7039c33c8d80aef7a/22248558615.pdfIn PDF document text
    • http://patroha.hu/file/62160476812.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/6883870669.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/nawemefi.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/vunidol.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/lebuzejikinamofabivo.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rusadefaxamozatisosoko.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614068ba55336---95193564976.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133e641b3192---42466505470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=qr+barcode+scanner+apkPDF 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_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 19056 bytes
SHA-256: 1b68d4f053ed544e06c9cbd0679d73c4f9e221e8da98f5345bec32e3aed42696
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10564 bytes
SHA-256: 508ac502fa84bba420c3aaef3310a42d05caca61cd80ebdd28f4de2951fda0fb

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