Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dfd813854b9259…

MALICIOUS

PDF

130.3 KB Created: 2021-08-19 20:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 288fcda22ba1b3149d35b8e659971ff4 SHA-1: aa859764d7e07600a8f9b4c304c16569302472f4 SHA-256: 09dfd813854b9259fa8e0c5c734ffa64266cb600fb354b4de88b671b40387418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS uploads, indicating a potential distribution or phishing scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=body+language+pictures+and+their+meanings PDF link annotation
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/24554652055.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/39530941288.pdfIn PDF document text
    • http://bjallstar.com/upload/file/52387032512.pdfIn PDF document text
    • https://digireg.gr/upload/32401866645.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e6ec05bd0d019234c6a6628bb4a1baec/zawasupeganorilo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f0fcd365---tikipinuvolewan.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2d2382ae---vemekoxor.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/figaf.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/28222040200.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4q0irjsda83dlqcosiokbcev0n/jariba.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/zaxed.pdfIn PDF document text
    • http://sireny.net/share/files/93318164276.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/73214375125.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/56597549901.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/7135981213.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fijisepufemakobanekotaliz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/52ec76fe7e24d049c870884b9495b650/fufukazivesow.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sidezomutixesokeguxurun.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/94478216485.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f69d458f---mivusinopolava.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771913234e2---4455559176.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/93731687936.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/jesivugajumi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4d473932---gimatikob.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/23556896399.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daba3e621d3---46196808347.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_off000199f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B207 11228 bytes
SHA-256: c94e70cde698f1a25b1879a21b5344b9564888f493edd62c19a7950279f4d69a
font_02_sfnt_off0001cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBFB 17712 bytes
SHA-256: 90f54d26817ed874472cf79a3d5334ee27eacbb27ec6160da9e87007ded15e99

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