Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd917b85c39a05c…

MALICIOUS

PDF

86.2 KB Created: 2021-08-05 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 75cc4ebef190e2e69b415f4061643655 SHA-1: a6fa3b73fc2b37c714a735ac6290152b07f9063b SHA-256: 5cd917b85c39a05cc9411289c2edf96a160dba6d5eef00c600767218d1880221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f32278a5c---nifazinexuwifesofusuju.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f20cb05f54caf39f1a808d244f7b3b8/gupovojalekepeke.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/47030510746.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4e57e06da3bdc9e57dba8346f27e1d31/46125172276.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2601d5da---pegedujigisifexozil.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/13663335524.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075454b9ab9f---pojabalubugise.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff42ece8e77---54402658318.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/8782676848.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/55644553894.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jovizelemodoleluji.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/87231478600.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841fc1f320---zavupaxo.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/15380672573.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/20937058683.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607644224ae63---fomerokuboga.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/savekapizopegenirixedopo.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/toxoli.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/60601116917.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/18f729cbc31ba0bee389d52e90271d4f/72137257121.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4de2d8b0965100db64aad7125e85ffac/sozupalozomizi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184b26b2f8---72405954639.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ug8h2n8j8ed0d0kvikat91mhkn/49215148250.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/garimulerazizabobomi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/88cd853ad5e26de9fa92ef484e5a6aea/78584521600.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1963ff4e---fivedivapoxixegeloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=going+to+exercises+pdf+with+answersPDF 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 11080 bytes
SHA-256: 886121efe8d957169d2f94b6ba7149500ba4c9e18a415de4b9848fdc6a2e67b7
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16616 bytes
SHA-256: 76732b774cb653e97262e31af79d89fc64718cfeb46531a00ac31290b6509dfb

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