Malicious PDF — malware analysis report

Static analysis result for SHA-256 3815186825de5aa3…

MALICIOUS

PDF

69.5 KB Created: 2021-07-17 02:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbd831add139a990bd03e798cf29d013 SHA-1: 5a787fb3d29a83a5f512202c433002e24a5d7010 SHA-256: 3815186825de5aa3eda45572efcb5c0a033c89c670fcf05a7153d454ad9be2da
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://doks-films.com/pcms/content/file/zevavewebewilobivorebizo.pdf In PDF document text
    • http://banquat.com/userfiles/files/83332439773.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/xidefebuvibazuzagivuf.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/73410641818.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b680d8d98ef---xatusofigaposas.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/79438705e395846cd7c30a8f0d9e5e94/jokukoxutuwarezufevufim.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8c5690e209341ef6f801931154d0f63b/58293382724.pdfIn PDF document text
    • https://123natura.com/stockages/files/puxemogitunamizedurapolog.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c164766e153---77747778958.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a797c121a79---5514790082.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56777215509.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/sl4rljqi3vv9v0j99a4cg3bk47/62647424690.pdfIn PDF document text
    • https://hgb.se/filer/file/46678371969.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739f23d14f3---sotevupifam.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/gidimubanaxev.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160916c6396cb4---gigazugomulitoxusepebofi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/popupenivedagisarodi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jujilumowiduvufa.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/60936710396.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776912bbb09---vudedugakimiperi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210717_4A537F6A0A430D59.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/savebi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/30bd7cf8c51ccd3984111e8b3f39a7cf/puvamuxebedisaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=10+ft+lbs+to+newton+metersPDF 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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 14760 bytes
SHA-256: 2f7af528f52a4357b4d1bec41a22c41fc815c1cf7c7edb5346551a0c5694cbce
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10424 bytes
SHA-256: 9ee45fa2597a961485eeefe1b66685ba0f500f44d2af9bb62b6e8c31129e5f95