Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e96b76ac4c27bfe…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 23:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53042ca544b7528a6031caca538c8dee SHA-1: 91f3ffcc5f30ebbdab4fb272f5b106ee0ff79eba SHA-256: 4e96b76ac4c27bfef718590391731eefe542a6e451561d7a31bfd75fa0c20cac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV also strongly indicate maliciousness. The primary attack pattern involves directing users to potentially malicious external websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/umskno5ge8vgg52bv1v34b9s61/9944335509.pdf In PDF document text
    • http://studio-castiglioni.com/userfiles/files/fomagabatukefejamesufa.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/15594748910.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f1a36c41---gebutafaparafikewipal.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656c1ca259---waxetobaka.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5ea990c8926fb1de9753ea88b2700428/87985261125.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8591a6ff---8585410997.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xerusejikimiradit.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e4d99345---44186807856.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/pojodudemezipifus.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/92174541827.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41e171461---dukenizenojixijewebixu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/18bc6db258d9cb4a164ae86782061bf5/medaxanepes.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716185b62a0---putunavabidofo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/lutapofefujizadin.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4c4c3200505869cb637d56f07bd071ad/pexemabivu.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/xujotelod.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/fsg3u3i98lv514cnr2cmfiv5tq/1393676587.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/22783901671.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/55597732351.pdfIn PDF document text
    • https://ghnservizi.com/file/32443374840.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vawezusenesiz.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e6a628f6d84d41be309075a81e4bf9cf/fekibebi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zanotemapexolum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bollywood+movies+free+online+websitesPDF 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_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16856 bytes
SHA-256: 3200e2a8e2f4d6c41e877e37a15fb60812d8dbfd6b5d24c287e4296fc6a626b0
font_01_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 10812 bytes
SHA-256: b87094b84b4365b834f6fc35618532bec40ab5bf5b160b3faef11683f92c97b3
font_02_sfnt_off0001485c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1