Malicious PDF — malware analysis report

Static analysis result for SHA-256 90afeb69475da6a3…

MALICIOUS

PDF

96.9 KB Created: 2021-07-05 12:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be1873cd0f0585a449e940323ead443c SHA-1: e55562d1b39e27291f3e2d07804cd31c4826628a SHA-256: 90afeb69475da6a3d859e8f3f81d16a1581356a32353150cc93a9f285599c3b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bdn10.cz/files/file/tudovuniburatenimun.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/514e597bfc36b07ca073f8060aedfb1f/zuxupojudi.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/11628650535.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8f87298dd9830ad7f9dd2295ef35908a/jezalakozedid.pdf
    • https://accuratesearch.com/userfiles/file/gasorizijigeret.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/723821df3f3491ca2ca577466961f707/31474358358.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f62a2dc6---27075772079.pdf
    • http://dentherapia.hu/files/file/zogewabo.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b9b45f85d4e9af17fbe1890d7681ba31/togitefo.pdf
    • https://bikeid.net/ckfinder/userfiles/files/wenapapavad.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/23a3dtchddd9u3iic5mhe4clqb/dupagixewotuwosize.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a37e9d66---61677580047.pdf
    • http://alternatifmedikal.com/img/userfiles/files/lenadivifobedajuguni.pdf
    • http://kaizousha.com/js/upload/files/gobegexepim.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f8ieuchrhnk35i2qeef8m9qa9p/57795579850.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/u7him6cb16ikadc3999tkc3cu2/simedivose.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5298c60b9d---kezesatoteranotusux.pdf
    • https://purefeeling8.com/data/file/jefugovonasefunavapo.pdf
    • http://taxicityplus.ru/userfiles/file/sokolagajamobepopeve.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/pukela.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aeb93bf51---romuraxijefoj.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb39851133---4600113134.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=software+testing+resume+for+1+year+experience
    • 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_off00011679.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes
font_01_sfnt_off00012e90.bin
f3644c59703e6241fd5ad2662aa4ff562eb519677d58b7978aa510a06829a52a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 11304 bytes
font_02_sfnt_off0001494d.bin
e8d48fecac1bd3bd5f7eb3843a4de63ebaca1ac205ea684c5f7713505118c978
pdf-font-stream PDF embedded font (sfnt) at offset 0x1494D 17152 bytes