Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e618222121cacf…

MALICIOUS

PDF

67.6 KB Created: 2021-09-29 05:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d357f9584a4eb123e25fb518dc4806dd SHA-1: 599427710b6f706d1af39bc8772c51bad6ad93f7 SHA-256: 38e618222121cacf20bb525fec887c7d6a68ee57f1e5f3e582ddcdcc3f4baf43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malware or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://coretry.ru/uplcv?utm_term=dream+league+games+2020+download PDF link annotation
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/taninibomavafujejo.pdfIn PDF document text
    • http://parateam.cz/file/movuvul.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/45985239896.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6d9df67a---43505481709.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/14811966748.pdfIn PDF document text
    • http://abworder.com/uploads/files/vivewer.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6f714a89e43e5a838b08c2c3b5804c/77847419748.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/talokuzododabuk.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/wizinijodapafozalik.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/xuzigumib.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/46599745709.pdfIn PDF document text
    • http://kleiberit.ru/files/file/40162595674.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/refipusagigixigexokixaw.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c799640d0f13033ac0f23eb5206660d/berarikug.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34326794076.pdfIn PDF document text
    • http://maihome.hu/admin1/file/vibitekegepurunowaram.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c464d290---53970846066.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/fawipe.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/10659378166.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/8267171812.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85862a6e6---55030356609.pdfIn PDF document text
    • 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_off0000acb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB2 14420 bytes
SHA-256: 649ed50db3b78cb22330670d5db61caa4cc6c98731028d3097f9e883224b3573
font_01_sfnt_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 10828 bytes
SHA-256: bc2b15b6f6abcef319d9c15d801243d7b108cbbf204b255096453d6c5a62d397
font_02_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1