Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96851d56dd2361e…

MALICIOUS

PDF

84.4 KB Created: 2021-10-11 01:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8001c988eb2a8f07ddddbcb2fafad650 SHA-1: 1ab24654f906bb0ac36c9e5ef02a9b5fe99f823f SHA-256: b96851d56dd2361edb2c2a148224d7dc0d6993c4f526b725c7bab784bb830115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload storage and other disposable hosting services strongly suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kalimati.in/userfiles/file/53181950799.pdf In PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/98182803358.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/41026172856.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/30234651237.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/18921958660.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/vavidoxejevigelojaxok.pdfIn PDF document text
    • http://aurora-c.jp/files/files/bidogunobo.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/5751099636.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3a5e5e7c05b6d4716ecca8febd780562/lafiruvazogavopiforam.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251c6e157b---63533207283.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a1fa173aea23d217f6abc5c2a1bf879b/19422461459.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/13592340734.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/videbenomoni.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/77640600729.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/milufarilatemore.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d647754a7e0559c812ffbe2f473992eb/kokataxugusenogarovamaxim.pdfIn PDF document text
    • http://atya.eu/files/file/44205899710.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/zitariganetoloxeruv.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614d53798d6f0---79424465337.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/nefuxubonane.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/miwaxobi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zazedove.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b1e85213---26615121398.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/97631761873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=time+of+year+crossword+cluePDF 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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 19764 bytes
SHA-256: 16d4d39611c4177670e06f4ed4122e6f6de9e251d5a973b0baa94d3bd6aea7ca
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 10696 bytes
SHA-256: 5b73bda82afd2ff9fb73c7a94b1f7fef6fff5a6618e62e8887eee6702975f796
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1