Malicious PDF — malware analysis report

Static analysis result for SHA-256 510f0421a76d411d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 07:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec2361b3540c7502a0df678eb15af1d4 SHA-1: 97c25aa00d1f761e017e03ddb47d7bb523972731 SHA-256: 510f0421a76d411dae46c500068f57c4d697c7ac92a6ff88a85e7f7defea7b5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also includes numerous external links, some pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a link farm with UTM parameters further indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51605028115.pdf In PDF document text
    • http://crystaltrade.hu/data/file/32591262042.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nilofirujajerig.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/18541168830.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5gvg6cq2t41plvhhn8qfian1u9/lepap.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kapevunizutejig.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zarejufufojoleb.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/25195814507.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/texaduloju.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/giwugajisegepilajugifa.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/2484233826.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/diwuzoterugakulavowo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/beziwitamal.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/boputisodujagibuvajo.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/wularevodugosupotisa.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/95663909074.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gudugalidigon.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/27116754206.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/dupetedek.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146a2035cc23---61551637794.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f5fhacttcam563qrha5a388g4a/pivebijatuzadedogi.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/jalosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dream+league+hack+versionPDF link annotation
    • 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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 10840 bytes
SHA-256: 2ffc69d60f687e3cd679777be786b305bbefc9de87436c4166aefc98ab3239f0
font_01_sfnt_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 17176 bytes
SHA-256: c0bb6772c9ef9fbc68775496862720649ddcf4bcce2bc746448a0fe254b09961
font_02_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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