Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dd6df7c643e9f8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 18:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 983fc01cdb153e8cb395ea088b038035 SHA-1: cc68b2540720b72b92b2b7de9e389338171a848c SHA-256: f8dd6df7c643e9f8ffb3c6df15d3c137505ff1a37c4589f8d8bc76d80969e492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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
  • 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://catamma.ru/uplcv?utm_term=les+trente+glorieuses+pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dhlnnne9ejlrjofncmpiqnfh43/fimasalosizi.pdf
    • http://thepducphat.com/upload/files/tosafipena.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2691ca8a265b836d9b390ab8b384842c/71587719796.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75290438908.pdf
    • https://balaji-technology.com/userfiles/file/73565619709.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a875c3be614---84408975842.pdf
    • http://materialdeestudo.top/userfiles/files/39452455683.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aed383bf4814b388a17d0a46974ab99b/26801555163.pdf
    • http://myblindz.com/fck_user_files/file/widamabilafevobineta.pdf
    • http://riskhedgetech.com/uploaded/file/101207548760aa4b86a9b40.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/68728353373.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d8995acd5---nomitevufumi.pdf
    • https://clickkedai.com/userfiles/file/68006403393.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3d4ab9ce---76678912700.pdf
    • http://www.como-grup.ro/fisiere/file/wisuwofepepirosogode.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zakurilufuxabowitopinin.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/47325473421.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabepogitifemi.pdf
    • http://lovesenergy.com/file/60434226149.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/249f02cd0d41eb95bf57eb24d361677e/sufapulula.pdf
    • https://giriconsultancy.com/content_files/files/sabobiripisefeguzefar.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/19k1j7spdsf75n3a9k26dj9dh4/41151995242.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mg0c6os195p53gjjrdaa28gei0/40543230792.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6e.bin
86039226d4df8878270f23f84870f4a46ac963c93193ff770a7da85b43c65d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 10568 bytes
font_01_sfnt_off0000d26b.bin
95c313213c8c997af29c54037d4049cc1f48d85f609140d5dbdfef7e9d53ef27
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16852 bytes
font_02_sfnt_off0000fcc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 16792 bytes