Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347be99f774d282…

MALICIOUS

PDF

83.0 KB Created: 2021-08-26 06:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f026ff00e60d7fe71d17e8e31640e9a0 SHA-1: 45a680b689a7a70ef3c438a0c644bbb213ca27a5 SHA-256: 8347be99f774d282ee02edff9b8f1be8fb7e1f39a94c97777dc0f38ef1d2ac72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://decoveinvestment.com/userfiles/file/fesekabululopow.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2a56cb474---jinasefuj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965c62f35---jebuvubopu.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/47383353560.pdfIn PDF document text
    • http://www.520amis.com/upload/files/tiwavowiju.pdfIn PDF document text
    • http://sswjeans.com/files/55813203419.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/lejerekokapu.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/13909814702.pdfIn PDF document text
    • http://nprofit.hk/userfiles/50671067162.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7b18e8300d6db788b458f50b24b712a9/rixifimemabex.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094aab9d883b---nulig.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/40680741782.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/84410173468.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9b973ba9---25587460958.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2ee206403755d4cf93b4dc1335d5cb4d/88379496071.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/riwakarobipigatotuxewosin.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/37149063989.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/xafalot.pdfIn PDF document text
    • https://tigaintan.com/contents//files/kosira.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/80249890950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+say+get+out+in+spanishPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 17340 bytes
SHA-256: 15f94e9670e891cc5388f957ace42d1a46fe8efcbc15616a861b3bb8dd284391
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10676 bytes
SHA-256: 231e926e706d33ef9311e4148664361ac340eefe80ad543b7502b214438702d8
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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