Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea338a35b8620b69…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 05:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 271f9c7927f08d326931b250a5f7596b SHA-1: de43fd972c475f1e5dfbc2ca69ced9782f7c2507 SHA-256: ea338a35b8620b6960c8595ae83a934d5ce794b76ce0ca46765c0a6fbdd58b1c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=how+to+to+get+robux+for+free PDF link annotation
    • http://www.sudaff.com/pics/file/62378215170.pdfIn PDF document text
    • http://benetalent.com/upload/files/44541379272.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4643fba2---79325946410.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/90097471122.pdfIn PDF document text
    • http://greenld.com/userfiles/sinerinilelewexulomew.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/notasasabigukuketigunito.pdfIn PDF document text
    • http://st03.it/userfiles/files/95505493094.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/86483726160.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/2571716823.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/9590791670.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00675228f---21222390527.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/45446376170.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/xuwofiwekuzafuvekiwup.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/62056919197.pdfIn PDF document text
    • https://cmoretv.com/userfiles/dixisarelejidujaf.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/wexezikufuxibuzetepilumer.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/36469630632.pdfIn PDF document text
    • http://dnepropress.net/files/file/tefibinopunifatibesuwegos.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/72283906958.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142138e386e1---29333871164.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zoxupofamase.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/38885776678.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sumefobo.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/rorukote.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/winifuwuganofeluwir.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bl4ia97p21ft93ju7uikactm35/kozixekox.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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 17600 bytes
SHA-256: 8907d4b97b5aff2471c72b8a850a1cf0c074c546ee367563e47efad90a1f2935
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 10236 bytes
SHA-256: d68b2d2f4b980f143d2b2183e98c6aaefcde2f13095432a95af76331b061ee8b

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