Malicious PDF — malware analysis report

Static analysis result for SHA-256 b476762dd626ca38…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 14:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15d05b1a1e18b17f30f1c6e9166f7984 SHA-1: 4cfb1539e52ef31418e630e8d1c669862c61d406 SHA-256: b476762dd626ca380dc790f585d32605f028b6f1a3d1dd6a3897fd69699a2906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://innotek.vn/uploads/news_file/zelimetiguronifav.pdf In PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/42161825067.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/lowonutexuxegosukumixoli.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/dokeguxumorewotep.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/37943312011.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/funiruwidi.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdfIn PDF document text
    • http://elitk.ru/_files/soterudikumukemiruxixani.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/23780806516.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cc151ceb---50865938124.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sogazaloxubowi.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/56594591969.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/fipijuneruno.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mibizojowokajunevogoram.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/78518152047.pdfIn PDF document text
    • http://knipia.com/userfiles/file/94281508377.pdfIn PDF document text
    • http://oodow.cn/upload/file/210911205515272754gfnwwakw0wl3.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58681092636.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/1311000894.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n66drpbeijg0muag5k1upgs816/69084732276.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/sosuvasoleropevetig.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/786547349.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/q43b597bj7gf96e0aisnaf4mtb/84356941655.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5c1b5be05538e6aa1ad5a66e8c64dff3/12426043649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=print+emails+from+android+phonePDF 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_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 17292 bytes
SHA-256: 8483edb752ca2fbaf5bb62e269939d66c8b7d1276984df45666eda818e62684b
font_01_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 10764 bytes
SHA-256: 9cb90f8874fb71f6c5c08bbcecd85d2c267ceafa4a94a4b31e288fcdcfe51eea