Malicious PDF — malware analysis report

Static analysis result for SHA-256 a179f33865cbe39a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-25 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ad844bbfb28ddbfb538b8c4241ecd9d SHA-1: 3d1978988f6e4c7e9ecdc84da5ada3862fd5ff12 SHA-256: a179f33865cbe39a467ed65f501fc5ef5f9966cadf7b04881ec7f33ce2140aa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://infrive.ru/uplcv?utm_term=vidmate+music+download+mp3+songs PDF link annotation
    • http://www.impactit.in/ckfinder/userfiles/files/13671330495.pdfIn PDF document text
    • http://normel.org/files/upload/file/januzebitexe.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/wivipobilebiwagik.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/85942324711.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c62a0cef---livupikojag.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a8c149098c10dacfd2414146b7c39ee0/87479328566.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/38363033355.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/woxefawulawogasunowisoses.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/61591749085.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dobadimibizixapanobipemo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613631f26ef48---62865550627.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lijufexoj.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/kidexudafevowadururev.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/disuxubizumukuzavoxuvu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pewegesotokopifutadiduxu.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210925050335.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/rozaxowusegomuditomew.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vewupe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb45075936---89012305132.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wadojukanokob.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137577f5b52f---mumumesid.pdfIn PDF document text
    • http://maksimetall.ru/files/88018726789.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/ramelunokubafagomo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b562f1f74f---senikimuwipisodagugilomod.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9ac6ed48826e43c76db4b04fc05acd7b/36028575993.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/dasojogupenekuk.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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 19096 bytes
SHA-256: 4682c6deb96c3b9665162d1a76dbb69a4f87365b220c98e682618c193845b7d6
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11084 bytes
SHA-256: fe269dfa4298b42dc071db2b307eda1b99b12b57cdd0821367d125c97349bbf3

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