Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e31800662c1bf03…

MALICIOUS

PDF

73.8 KB Created: 2021-10-09 02:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8a0f5d9dab2dc492013007fd7a46e7c0 SHA-1: 0657d6d6286aad5fc8e9c23392823a9cdf7b50fa SHA-256: 1e31800662c1bf033f7119c97219657a52fe43ce3c4f4842ef4cfc926574f8ca
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 executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152144dc5da7---zovodasujotesuji.pdf In PDF document text
    • http://medigroupvn.com/upload/files/7096915302.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/92368001790.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/mobilimawavamojujekezuku.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f088b8ae3---lewokisotidu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905154831.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/guwaxariwoboxosenevasa.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/tusosovog.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/64458700611.pdfIn PDF document text
    • https://demowz.reikor.com/webimages/files/wumuxawotat.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/semepobaputojarozivoze.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/xogugiduvapewofenuxi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/16112272391.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/famajatudu.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/45090226244.pdfIn PDF document text
    • http://sireny.net/share/files/96704235964.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/13119b5732bbe7b31dc737523b55057a/99606845959.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/fikonelekigemefijun.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/lizaxozapozi.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/61420135921.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b8qdisop7f4mbm3rg134a8cfd6/pivizajaz.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/nogukamanakado.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/mugetoxoraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lie+of+the+tithePDF 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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 9688 bytes
SHA-256: ca7d502c2c56ed14cbeda8b0fc19fc1342029811cbf78d0524b415a0cc8b5be0
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 17312 bytes
SHA-256: ff8255acb22950c4926696d9f2db29b7d0ddb5de8278eba01d331e74b2ba28d1
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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