Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c593b690a3b4ca9…

MALICIOUS

PDF

96.8 KB Created: 2021-07-22 02:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62f293778ad1376615cf87efffc7ea00 SHA-1: 77e7c23e2b6c0e97843de06ab886513cacd13ed6 SHA-256: 6c593b690a3b4ca92a5fad864bd04c5d622eb5b0dfd834c9adf3877d0919e380
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The presence of external URIs and links to potentially compromised CMS uploads suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.alex-vasilkov.ru/images/wisdom/file/72268529769.pdf In PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/getaritodegejizexeg.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757485bd057---56508606063.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/kobajelomopilij.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///67621365404.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/purewovegebevuxema.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b294ae5935---pudeg.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9ceca425---jebiverode.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/97623075254.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/taregosinukuzononiwapi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rilawuvuxesi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e1a020d94076dea056292fd60486b1f6/jodolitata.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/tijopukulovifotimatifuru.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fc8b875f0110cc596b224c7048f077d5/45421735856.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160873cc915db0---manix.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/1858003834.pdfIn PDF document text
    • https://actorconseil.com/files/file/98278728307.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/50786817626.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68dc10be4---guvixe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9294973e6d---tobutovi.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vepegufozi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/3706511221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=greater+shadow+protection+potion+wow+classicPDF 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_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 10736 bytes
SHA-256: 6a0c5ed120f17ab0d9ebb0115a54ed4c18057889255dcac4227f2aba9966fbab
font_01_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 17352 bytes
SHA-256: 9a379e4090bbf1cc09133bcf848b51f0aceb4b40629395f640196809174a697a
font_02_sfnt_off00015c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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