Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df65567da3155f…

MALICIOUS

PDF

133.2 KB Created: 2021-07-17 09:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3ad03370a4dfd9738ca65d7303426db SHA-1: 503d227ec8db2d3bc998c82aad1c9a5811c636ab SHA-256: 92df65567da3155f8c2985aad5ed186d0b4a2f1ca449b070297a8d8406025dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage download or redirection scheme designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2eee0bc9---gijemofisoni.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca39572b4---kejovekumajo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8bb86ef3c52c4a4a9db4a9aa8eaef29f/1254911343.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2754770c---2592325647.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd4452a22---27530591684.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/60b477a0ba9befa77e8f7a6623c6581d/81353119720.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/refazekodosogumet.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087db3aee70b---dezesugalipove.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95248816842.pdfIn PDF document text
    • https://hirurgija.me//files/jojajonilexamu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e86d1cd63daa6f8ef560aa5b71658e19/tutevewa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ce04f8c7---momobobimemonogalaj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/664332869939f5c5a8084a7526fe17c2/22481475443.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/rutapapizememiwokulem.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/m8n6ne0ar0nui3g8a0u0aknvko/52393991603.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0758c71bc---3009841317.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/zibapiki.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/180c8edaf42358563fbed0f81600810f/vigekexibidemot.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/futulavezumevugeniko.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/nufoxoxadivet.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dixezulokaw.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bekedabexuvuxawisu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/91302773856.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/gabomedosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=define+formal+operationsPDF 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_off0001a6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C5 18032 bytes
SHA-256: 2ae8e6c39faf47aa7b1f865cb851b0b1b484b959cee587597f1ee4d4ecf01a49
font_01_sfnt_off0001d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D592 10520 bytes
SHA-256: 3189121e40b0653c1b80a7ffa6ef756350dc4142701e05b8668b96c314025a26
font_02_sfnt_off0001ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1