Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8f33a8d44e896d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdf0c113915616f5c516e072985a971d SHA-1: 4a202681274f4326ffe10707ccbba3e63a5a14d7 SHA-256: 4d8f33a8d44e896d36c527febbbfd4f4e03ae9f0017fdae39e229dc68be464c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination or leverage existing vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=endomorph+workout+plan+female+pdf PDF link annotation
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/gadaviwe.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fosiweduvibegirunuzu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2621307d---86638489832.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/606430aea598ae0d71335f0824b02fed/ribumelujukunafegezipefof.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/perajorana.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vkk714ugk44us6g0vndjm02mav/fovopapof.pdfIn PDF document text
    • http://fructusartis.com/i/File/juxiga.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/pulopekilojegijiwoda.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607263c8deff2---dawinebefezoneko.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/48035262869.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/suzazegofegidejuxojidagef.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cjvjr49kb82gbh6t09gfl2rb9g/gijubowumiduzemumudap.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/43631898910.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/86850322447.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b71bcd3e4d6---nudekuduxexikawapibol.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/48675819920.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/54106768127.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/57342530323.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/jujivototumofan.pdfIn PDF document text
    • http://anm-av.de/uploads/files/17364681502.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/39891744681.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160840284c31cc---91843283320.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0f25c6ae---16392583207.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mesamube.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_off0000c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16676 bytes
SHA-256: 0f52125fe1906544fb986dcbb68ff309064dba8288e6890e8fd7987b82eeeaf8
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 10764 bytes
SHA-256: 958e69ede4f3ac918f57a66cc229632d460a644b7bfbe869dddea476473aad2d

Open this report in the interactive analyzer, or submit your own file for analysis.