Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8eb7a3127f8e32…

MALICIOUS

PDF

80.6 KB Created: 2021-10-05 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9a1a675220f6bd0e7d4ea45ba97e07f SHA-1: ae2524426813eeda0ed4d895c7dfff8f479570c2 SHA-256: 8a8eb7a3127f8e32566c52daadd6a710a42571ffb369e14f4b821df6df367ad6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several URLs were extracted, some pointing to compromised WordPress uploads, suggesting a pattern of using compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615118598475b---54610308943.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eor8rigl0a58qse9vrjoo43lj3/42325578948.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vabitozogilopudisulut.pdfIn PDF document text
    • http://promenade-perpignan.com/userfiles/file/kuvewumuwexokefexulevuxoj.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/ponibagigajidakimafusa.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/56382069811.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/90024757663.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/2800037473.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/16597805665.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210919_93F206A3DDBF9445.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/midonotevekam.pdfIn PDF document text
    • http://charivne.info/images/file/85858194148.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/29571419626.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/6464127360.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/192bb7b9249c9d02fc3cacb959443084/bojovofuxe.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/87738415585.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161570a7d4ef1e---xujiguxexodisasazurepim.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/gevewer.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/37579139866.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210923020327.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/lanomobexor.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/jojububoje.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/nafinobidubutewokulaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+self+beliefPDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 19016 bytes
SHA-256: 27c4df31a08080799a959bf3f6188d1b0fead457f896e407af57f4adb5a96e91
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10324 bytes
SHA-256: 899e45d3b6097c455eb25224baab1df8156289d493a417b2761b136b0e495dd1
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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