Malicious PDF — malware analysis report

Static analysis result for SHA-256 67968a8d6dc72c94…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b87493058971df6d69c0a61db6de3fe SHA-1: 1b29db8f0680e91b2ea1170490c6f15e8b26f9a8 SHA-256: 67968a8d6dc72c94866325d03585a1fb9bc0bf756aa110a801f7cbef498d2a1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=bus+game+play+store PDF link annotation
    • http://xyr59.com/filespath/files/20210914185212.pdfIn PDF document text
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/seninedu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/ruxofapebakarumomenibu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136999f4e33e---18116576263.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zamozim.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210909180226.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/fizokejozusoxogugubix.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/2709366743.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/fimixo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/9718719673.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/mijaluzovusure.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2c3912b8---dibivejemimum.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/rufudotemowirurevilabodeb.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/230703_30597472888.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b30e2ef2804d9b7b24c569673ba76060/kidumovobazofeti.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/lebegemal.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/87488728290.pdfIn PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • https://comfort8889.com/upload/files/27444804139.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/49360899596.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109160523019082.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fidofiteputunobonun.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/797d82c7145895f08e318edbed51fe32/49667499287.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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10664 bytes
SHA-256: bb7b4451870b18a50c3a3ae0d50fb156541790d619e582f2b1d19454d571fee0
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17956 bytes
SHA-256: a5623c10d352bb213f7e7518b628984fdd0037661a431f5dfb3c87c270bba82a
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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