Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab5e4d7f2c53bc…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 06:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7cb37434e73eb089806e8d3f71a495e9 SHA-1: 7409d351414a0e7a0c92b6cd601b6cf7f86667bc SHA-256: d6ab5e4d7f2c53bc267731aad0111c612a872c17eb88613a33039ed71f3d8c9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF document exhibits social engineering tactics, instructing the user to disable security software and execute a command, which is a common precursor to downloading and running a second-stage payload. The ML classifier strongly indicates maliciousness, and the numerous embedded URLs point to compromised WordPress sites, suggesting a link farm used for hosting malicious content. No scripts were extracted, but the document's structure and heuristics strongly suggest an attempt to bypass security controls and execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/q860ogvi622b31g47v78fc0kg5/gikababobifov.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3443bbdac---wugekujevarerewapexiwu.pdfIn PDF document text
    • http://kleiberit.ru/files/file/vifovefixuletumeduj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ec4ea0c7d7d111b711de2ec12916515a/59083731014.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/72209675552.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/fanemedebijonexinob.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84840275043.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tagalig.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6835d429197667c70b82d72839f2f481/gavenusemijafeta.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99fce724037ef73ced0125f313f9a5b3/18204743326.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1d7e742---5505807647.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/62628217761.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c04386d8460---3356907423.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5rq6o3hik22hhn59bavhpc4nne/zudavaxidogad.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///sutozijasi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/88c8a3ddfce5019a99a4deb5c656ffbb/7864035585.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160867acaf0798---pemisukezemufaxinomo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf682426d---45121659485.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/zomorujisafozofif.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/54235330973.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if7plrjt062sq7tmlgp4pftu6f/kixitetewivulakojojamima.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/7726119547.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a310a624---nugujirode.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/292b84dbfba18d378763c22a51d1f67c/20682323341.pdfIn PDF document text
    • https://intersat.lv/files/file/febuxuvowobosopoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=why+telegram+is+not+workingPDF 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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 10840 bytes
SHA-256: c3da13d28c3bf7991dbcf0d5090a9752bfa5a9c117b0187d1098f30a71a18ac3
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 17320 bytes
SHA-256: 7469bf485d229c710abdd44ce9535d86283bd287fd4fec979e2657d911f6e8c3
font_02_sfnt_off000137c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1