Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ecbd182b9773bb…

MALICIOUS

PDF

94.7 KB Created: 2021-07-30 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c487d109e507b8bd8d1400bd8c505cf3 SHA-1: 057cefd9127023d43aa8c4e93f504b352f4a609d SHA-256: c4ecbd182b9773bbef0b6d194091a507d397404925810e2ad43cee0a7bf6a01d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=ejercicios+resueltos+de+potencias+y+raices+3+eso+pdf PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f27a4855a8b59afd354b434578c34379/waviloxipitugi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/30ede349152e480c8ceb8ae5a460bd4d/lelababajoku.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitezugagajojadaporoxex.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/400kigeqsdonliho1dsiecimem/rutofijofonikuru.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/wezowozosufujo.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/95815371677.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7q3hvdrvegmo5op5nnv1qsp9t0/63500286024.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/73105897242.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/313b74cd03c99c99973c87f42a9935e1/jazovenamosisibenitof.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/81542959549.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f8c7951b---disaf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ba611892---jurokulosemuweji.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/zunanoravimivuzepawana.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96ff50bd3---wemijarokavuju.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/35081660512.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vj56n7rik0mvg9ekufpr93tqop/90238024814.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/49617453056.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/73328502819.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a4c57cab7d924439f665a04d8061f60/44489756415.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/83520841948.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/90068123373.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d506a90f984---wuvofilekenarosavubuxoval.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210707_2DFE5D9F39D7820A.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/vavigaresivinivolozonusex.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nideraguxawodeted.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 11112 bytes
SHA-256: 065bf305550d75064e2268d4fd01c49bfdd362a965911ae6f93f7b65d369bd4a
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16304 bytes
SHA-256: fd831f8a239d989b17d634ff15357c15abceab4494fee6227fe5cb1b70c826aa
font_03_sfnt_off00013a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 19124 bytes
SHA-256: 36824ecd31981826dd01478388487ffc3e98854c74fa8c2a3af76e52b37d197f

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