Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c3959b9a87fa5…

MALICIOUS

PDF

63.7 KB Created: 2021-09-27 01:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 901e6fcf6d61ab1ec2e18b93bdfcd8aa SHA-1: 973fdcfb16c2029a80214cc6176d1328d4e4d612 SHA-256: 793c3959b9a87fa564f4474da4871dc6f9e104b91092632dc0f6d43d0586cf6d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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.
  • 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://huntic.ru/uplcv?utm_term=multiplayer+io+games+with+friends PDF link annotation
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/fovoxilowupiwavufiw.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/woresus.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/tugumimowurugabijusezoj.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/27376101384.pdfIn PDF document text
    • https://edgecs.com/documents/totode.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/39462817140.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/7703135947.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/dokixaleparipebexuvugap.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/rafujesazawesiruxedige.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/zopibefed.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/49545125373.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83b16e8414441d55b2d2c5dc8b90aec3/88768428719.pdfIn PDF document text
    • https://funke.be/data/file/57779491864.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/xagufotukipalivelov.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/89030923262.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/29319269941.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/punuleraw.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/41873183185.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9e897a56c---madulefasurete.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/27565096189.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/43496018224.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_off0000ae20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 11236 bytes
SHA-256: 14e312ea28501f402db742e38dbfc41430939238ffea7ac6d7f7d243d5b161fb

Open this report in the interactive analyzer, or submit your own file for analysis.