Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d564f5bfc622ae5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 19:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43b5ca75d07bb04ad765471769ac4f58 SHA-1: a29cbb84b5aa3da9d03f7012f342fab99ef4a7c9 SHA-256: 9d564f5bfc622ae548f75aec74c4a6f41cc91cc8e8200dcd0ec953445ac1042e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=action+verbs+that+start+with+a PDF link annotation
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cdfd07e6433d59f3e6054822adce07ce/sebavajem.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/28042731236.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zosivonetegabipelegomo.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/juzomuludonore.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc47f453cc---87152090365.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cafe89bdd---11545011118.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b05efaee95e8a4ce140e5f5d31a3aa43/48372847400.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/zoboxunapapet.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210909233333921.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c185447fd31da1f5f0da7959d6b11041/23447034495.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/50768601811.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1fd0fec3c5eaf65c7b4b8cfadaab155/basikosibagidu.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/73089886383.pdfIn PDF document text
    • http://agmapure.com/upload/files/lofuvitarodesoweded.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/1410586083.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/47903298257.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/77859195275.pdfIn PDF document text
    • http://landia-print.com/pdir/file/76248745255.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dolenadurefu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138b2a3635ce---folodiwovagi.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/morema.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63183076891.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/12044578391.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/49797551581.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 17248 bytes
SHA-256: df7974443171b5343083ce30f3bbc74045bb17f4f205eab47f9e9cf86cb44301
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 10556 bytes
SHA-256: 703773db147a0491a2681b4f38d7aeea64bdad8c6b0a2e26c154442d05698b73
font_03_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 17228 bytes
SHA-256: 94e7209930c942868d8b7d09daac5721bd22751aa1b62241425b1eaa89848069

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