Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29240f5aace7ad4…

MALICIOUS

PDF

80.9 KB Created: 2021-06-24 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9633e81c948120a4e9c19cd69b2aa9e SHA-1: a3ff1020bc793ca7363cbfff05d6caf236e60505 SHA-256: a29240f5aace7ad4d48f74be314b237da81b2f8694c9f0d7f31457ecb924fa16
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/in7262t0v3re7qvrhtkasbgljl/50593861781.pdf
    • https://chief-moving.com/editor_upload/file/pifegojiferokejoradabiz.pdf
    • http://www.aadhar-interior.com/userfiles/file/xojogokawubomujadebiredo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160825b8162a58---tufimopofuzifaz.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/ce1c8e03742f351249223c03d8c6af07/pezezipoxipitoge.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/aac97823dabda248f657b794a4d1529d/59527478060.pdf
    • https://astek-telem.fr/userfiles/file/zolotunolosajikirepuk.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8087c946c1---49460516539.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd90e137c---sifikevidifenulozej.pdf
    • http://accronline.com/userfiles/file/finexevimanomosodowozoji.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bd9ca5df4---61159426975.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727c9499530---bunuvawomowasimomir.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/294b6a69cf09b7f87a427a2d01dd4e9d/lutusimerumosoxivo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e67bb9392---waruzinekatufopib.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c17ba3962ab5b4284edf0f509cf5252b/53202897786.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7e4ca80c---9935624637.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/mamejetuvawizopeduso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=xenoverse+parallel+quest+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec25.bin
267cfc738ac8e85f215ae512d0ae3bdf583d0456c4e0a5df555b2fd48a73de1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5172 bytes
font_01_sfnt_off0000fdbd.bin
620d17b92e6b1b608464c1201e5e4f5007f6b8835b12da5a514fa6acfd7f027c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 13172 bytes
font_02_sfnt_off00012810.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 4324 bytes