Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f35fb09fcf550bc…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 02:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 822b37893c0375a0ab60eacec9d4081a SHA-1: d4aa4c4854e8c7cce801ba91b322e71cf2cb8c0e SHA-256: 1f35fb09fcf550bc9696ea0c6757cff99f22e98b86a4584ea136ea6a07214316
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, pointing to numerous URLs hosted on what appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. ClamAV and ML classifiers strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f69eaaa39---86891986914.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/teberu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/830uf8udqrag10kko2c77rkp1n/19415446218.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113b9394f369---9181599088.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/82143697891.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i6lur47tjepb46ehgprqeu732n/98512827021.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nevevumefidebetakezir.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dedotilujerapegoxuwu.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/70851095384.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hf8qfcjo26sluf3vgq64h79p5i/95382832860.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080709162534.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/samatijoxedop.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102ef7ed4615---56069195833.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/24524119851.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210815050717.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/23977613190.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/midupozomefadufunuteto.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xozetafolebidepegim.pdfIn PDF document text
    • https://seerupit.dk/assens/file/fovopawowuran.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xavikopemumopox.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e7192b29---95715585910.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/posuwogofojesujawonure.pdfIn PDF document text
    • http://adveotec.com/img/file/51742456412.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d54a06636756c9b4b7e8328af6fc663b/desavofalad.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33610091505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=electricity+billing+system+project+pdfPDF 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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 17012 bytes
SHA-256: 6ade291eefb9c1d37683a919d118607c76402d88866b877a604a4b5e10516ba7
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 11168 bytes
SHA-256: e5676b953362530b26b00bf51e63a742fe40cdbfafff9f0e7d9b9164af006c55

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