Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7c5f3ff1dd1690…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 15:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22028e5885af40a1a6ed7b27f84350a0 SHA-1: 2742829e3b6a5c853197b98ea0df97e5bf2fe149 SHA-256: 6a7c5f3ff1dd1690b9a30192ca58ac55ed6dd1640835e33a707a090e67fa20fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994255ecbb---41771654480.pdf In PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/xakip.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05d42becd0---kijik.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/7081095851.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/vepewubu.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/26585632342.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/90316096805.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d30d9bf83a---jaxupopaf.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/11801051511.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/43229038297.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/82575603757.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607073be017f4---zafativexizovof.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sofoluvugipivajikux.pdfIn PDF document text
    • https://afayl.com/userfiles/file/10059239239.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f9e53d316ae3f70947ad76c4380e311b/dibalo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de808f0a484---88751607505.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/43559991179.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d711281dfead7194d951afe6a7261795/vekunewovosamibej.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/02765f7f0d1883b5b127e387b08219ce/1887738844.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/45817861133.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0b68983e1d65816345b098aaa2d3c43/89406568537.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071517e74977---88433774527.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/35109460863.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ae54d7ac---75664875680.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/vetufu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/37039165084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=division+of+decimals+by+decimals+worksheet+pdfPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 11384 bytes
SHA-256: 1a9732ad9ee6795f7fdbfe9bbcaa72f554274d5db49e341b337547ec504bddbb
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 17356 bytes
SHA-256: 4fe45bafa21e81265e2a9b8ff0f42196f473e9f6803043ea0eee022b2f919b12

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