Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b9933d9327ba9f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 03:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 528c20517f95be5c3e5750f0005a2875 SHA-1: fc369b16eeffb9fc4c855fe519955216a18ffc54 SHA-256: 71b9933d9327ba9f2a1a00fa511fe7764e09a45293cc404df252c4166f3fea69
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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://garglob.ru/uplcv?utm_term=d%26d+5e+dungeon+master%27s+guide+pdf PDF link annotation
    • https://doosradashak.in/ci/userfiles/files/21838623939.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631894214.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/44889659185.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/52736704098.pdfIn PDF document text
    • https://lesura.net/userfiles/file/potebunozoviwix.pdfIn PDF document text
    • http://orem.mn/uploads/files/texag.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/mutinikunonu.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/45627248405.pdfIn PDF document text
    • https://yifff.se/userfiles/file/84697430327.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a060ae45753f314daedf8113abffcd40/bilelo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/gagaj.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/25407254104.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/nibonusoverusedidal.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/wigub.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/472caa45ef9e8152da68584ecd8438e0/68441411658.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/koleredagixudogutoma.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135007e62f96---fibisotitofatoxasifub.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68278041015.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/38312b52c356cd1724f240da8e13eff2/66198304948.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/64525139751.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/kipevuxekibe.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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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