Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f2ddcba464f92c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 15:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92cbf42c07cfd6980b98b1aba67d1e2c SHA-1: e771c0bae74702d253975e028b7fd53a81528fd8 SHA-256: 13f2ddcba464f92cb31769d63de9704f179d94afc6c6bd24f6d7d2ddfc0fc4f4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress upload storage locations and disposable hosting. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8214

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f512434bd9f94d80a7bf27a3f821a3da/97811388085.pdf In PDF document text
    • https://kingyao.com/uploadfiles/files/20210816_025220_9220.pdfIn PDF document text
    • http://aimic.com/userfiles/file/62009038839.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/furobalilofivev.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kejenapisusabi.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/8845463922.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ac4a19e9---54592866340.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/93582268012.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/xolamadujugepik.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5267bf1a5---61020067394.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/8046345001.pdfIn PDF document text
    • http://henca.com/files/details/file/rosesofafu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wupujax.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9qshj7l6iikh3itnmp7bc7fm5b/49807794060.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/votepixazekufedikijos.pdfIn PDF document text
    • http://balone.net/_upload/file///nenamoge.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/79872202527.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/11402936322.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2e6216e42bd22b9ad94f65c9dd5a92ea/1494919346.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba30dbc7b---lisosagetegukibisonomute.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/5043075494.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896b3c5eba5---japevulawodefupanulakod.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/lopemunaw.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c75e153f8---zaxaruja.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6m7qak9i2ddojrn4lvd8ik2a6d/75199393185.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5mbfctg1b4rgeavke4mqdsrkl6/vugixedebevofukifo.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/23502357625.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/migez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tc+helicon+voicelive+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 18740 bytes
SHA-256: 45d78623ca258f2db2be352c78582eb7183f52c6b743742fd54313d7127ed419