Malicious PDF — malware analysis report

Static analysis result for SHA-256 481d94fc280e345e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-30 12:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 760cd4960a40c889a3d6d66dbee8a09b SHA-1: 932467bf8846bb9080d62a2272e52c3e7d802524 SHA-256: 481d94fc280e345e5cc76d2939b4c51610c649b797df22878fae0362f65cbb8c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier further indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 6

  • 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
  • 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://medvor.ru/uplcv?utm_term=best+4k+games+for+android PDF link annotation
    • https://festacontinua.it/public/file/70078544238.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/seloxawogupag.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/et5ci36b0mrovbdnoqoccnqhor/tupide.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140512558b1f---getudaginevuja.pdfIn PDF document text
    • https://polaria.cz/images/file/55248224518.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/81785083939.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/xevugutiribixoviwerizofek.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/55222295350.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bfb2c9e835b1e8cac0492ade466ce568/tiwiwivutovedafezevupiru.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/kinimo.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/77990846466.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/99834524973.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9d00ea2527e0f6a048658fe24dd69905/78076305692.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/53320062294.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90187056267.pdfIn PDF document text
    • https://rafautama.com/uploads/file/nosemonorikalukamedowu.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xurobomavokebuwotada.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c61150f3ab---kexuvafirositegu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/28257370415.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/38190601070.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/jabipin.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/7976438399.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e18b0ab3b94e6bdd10b3e3332e303fb2/tawevafogepuzokuxiwunibak.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 14976 bytes
SHA-256: fa6b159807ea43696c93817bf62115c7cdb2eeb00c19452a737d361ffc9359e3

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