Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15e72d8e7eae416…

MALICIOUS

PDF

97.2 KB Created: 2021-08-01 06:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179305a8d0fa8c2f1ca86894e61a90ac SHA-1: c94f99dc1df8794e5d3442745d05a65ad3e9db18 SHA-256: e15e72d8e7eae4164836b5f0ad53dbd239bfebc4c00cb48610e383c0e78e2e75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://2446665a.ru/ckfinder/userfiles/files/depedowopa.pdf
    • http://akinmedikal.com/uploads/file/xefenemipetaxu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6l9ut7pq1f9t6q0p1cu4dgh3m5/26458405845.pdf
    • http://atol-res.pl/uploads/file/raxozugexuzafaxugexolij.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/52790851488.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/olukjde0onlbre319pbqmrf43a/29565585079.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tnl13ksn8a7u8opnrrkh2gski6/sodoxawukutirexegudogenuw.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d99cdbbe1cf90117be9a77ae8af6c6a7/balusedalof.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b493905e4be097d6317c0d758dc98f0f/2643762422.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zafit.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160791fd6d8fd0---60518762067.pdf
    • https://datajournonepal.org/files/76365494040.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc3598d82---78976023270.pdf
    • http://broadmoor79.com/clients/864886/File/fugejegajiged.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae849ddf82---mokujukigumiparexujimisod.pdf
    • https://tecnibat.net/uploads/archivos/70045472728.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9177b27ab---51852898066.pdf
    • https://egokituz.eus/files/galeria/files/kanavejudepimerugepo.pdf
    • https://nestaerospace.com/uploads/file/38922657195.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6158cb5d733cf596f89c23abbae5fdfd/junovodo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db28311b41---71565659942.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609057101bfd0---33700443224.pdf
    • http://ya-ke.cn/admin/upload/57016133247.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sa7tui0ij307o52skmv0r8l2ii/dusenelunevutorisados.pdf
    • https://ajur.rest/uploads/userfiles/file/dalurefedomelamatagibok.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c7lejui9po7mogc87ojn1se7ur/menorapi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+give+a+case+interview
    • 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_off000117f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
font_01_sfnt_off00013005.bin
1460d2fc71506e7d152a64dc59ebeefc41c0bb699dfc807737ece4a042917c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 17712 bytes
font_02_sfnt_off00015e3f.bin
4388422e15bd3baf62577bb222bc181c58b4cebf6b1fc9b448bea17f56fab847
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3F 10500 bytes