Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d70f0ec3d9e65b7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 20:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b8868adbc98165d24580e56106948df SHA-1: 1341a08174595a23892c0543058c73fe1eef296f SHA-256: 5d70f0ec3d9e65b7758b4a23babad299965f62a6417b1219aee5f7925896a80a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits social engineering tactics, specifically a 'ClickFix' attack, instructing the user to press Win+R or paste a command into a terminal. This is a common method to bypass macro restrictions and execute arbitrary commands. The document also contains numerous embedded URLs, several of which point to compromised websites or disposable hosting, suggesting a distribution network for malicious payloads. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=outlook+print+to+pdf+not+working PDF link annotation
    • http://test-immo.com/file/52436558202.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/posimotutotewawaniw.pdfIn PDF document text
    • http://prestopc.it/upload/file/49619857940.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/jatugugolenalejosivesu.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/lolobivoguvelazarizo.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/73505583384.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_052502.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/27f50093f96769c8c0095711635cabed/xosaw.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zetokifokusori.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jarifa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zaxozutakizowabalotesi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9749acbde---kewemutolon.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/norisulunepepixunez.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/mizuwuk.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7d5544fdbdb6308c26179d7dd2561574/wejisam.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/fumuteza.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/gudafojinemevaputuzeti.pdfIn PDF document text
    • https://cape-electronics.com/media/file/relizomivamaregazepu.pdfIn PDF document text
    • http://fxlcd.com/upload/file/25710025662.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/dilogar.pdfIn PDF document text
    • http://honda-vo.com/upload/file/85898730041.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3b50f4986a4f83444b849ffee2a8ecc5/jonuxafowixoladoz.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vagiwimijo.pdfIn PDF document text
    • https://signika.pl/Upload/file/voworoxejibus.pdfIn PDF document text
    • 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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 18656 bytes
SHA-256: 8f4feb2c5a8809abc22c0d8f2e7db52bb764630052ccc6c9d7ccb7fb21cc1c00
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10516 bytes
SHA-256: 8d0f3dfd78352939f9a02f2f1171cb01eb22406f62de7780ad51e65f751adac9
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.