Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5c5fece1c61366…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 20:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf80021ec1836b3782d53c3220f8db4f SHA-1: e54b8140dc75532daa6960195f264898bcbd51a1 SHA-256: 8e5c5fece1c6136651caaf9b7fa647a4abd59256760104ce3da62e9bca770e0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs that point to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=mr+and+mrs+420+returns+full+movie+download+hd+720p PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5658fb1---49133774859.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342aed83bcb---dovuturizolugonu.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lofepiledonozaxe.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be5e8c5e2---37834754872.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/93270747010.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09e9b011---totedozide.pdfIn PDF document text
    • https://langumeistras.lt/i/File/rudagasolujaxamupugugesu.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/bufelulirepa.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vepapuvojowijujawoter.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/4240871132.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6p64vav0k5jhte3fctilomq58k/62170233614.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/dugowaro.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/15780228926.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b104f7dc---fivemadobumoken.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zevezodubij.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/977f70227ce4073e4c6e7b54f182d572/rojawixaforuret.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/mitoremekarusofogupozuxi.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/24537895830.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb89e8e54---7219052954.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/327270120.pdfIn PDF document text
    • https://resicolor.com/upload/files/32883994622.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/bekir.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77054535435.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210906_5479CFEC9DF1CB0D.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/xigitenuvijigigi.pdfIn PDF document text
    • 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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 11380 bytes
SHA-256: a8b17cc9d703d318e82d026eb1d9fd240ccf9c559d7eaaf577887805b58e3b80
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 18424 bytes
SHA-256: 1481ab4af7cde837006568c413f0925416f9f0108ca9096d66e3a8003f69b259

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