Malicious PDF — malware analysis report

Static analysis result for SHA-256 43873af09ff621a8…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 03:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6e0fab0a8c3a321f331337ec16fb3a5 SHA-1: dffba2e54e86b0038ef4be8c53f4056735acf4bd SHA-256: 43873af09ff621a8c666d3397a5c1251a5da4e7991fa48e2f0bbcdc712da4f63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links pointing to compromised WordPress uploads and disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zonweringbelgie.be/ckfinder/userfiles/files/rukomaguvexa.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdadeae5a---puwekemukataponuwisekax.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/zimus.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/52395277821.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210818/files/20210818193521.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zokefikufaje.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277e1240b20---52677667816.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/58537853918.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106051721198523.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6310d91e6bda00ea9a8be2bec18c0171/bobavowudizemawan.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb68d4a83e6---duwajusejuxulivorabuz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611779d8c314b---72164907855.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/jadet.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160842b8035c93---wikemij.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108132018353372.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/27153015465.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/40290368511.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/56692001107.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/15b21b35f0c644e0a6dfbd9f2e0c9d42/zaxizilafakebuvonig.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/3162881114.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/14395182625.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adfcd28a9---47939123611.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/69237603607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=write+or+wrong+identityPDF 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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 17768 bytes
SHA-256: f32b9663c6e5587da0813be6d30db445ffe2a995e17c732d1e86f5fe9c15cb91
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 10240 bytes
SHA-256: 017130441cb811a707d46c636ce634ca2fb95f0c4997e180aa222a2fe1fdc56f

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