Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a74031f25969126…

MALICIOUS

PDF

88.3 KB Created: 2021-08-26 04:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5087d7f8880c0f5d6c4a04f6892f8ae6 SHA-1: 8d6cb31d4e763f42978bd5340ec93235efc7dd1e SHA-256: 4a74031f25969126a003330e7b6b15f3e8e29873d7a9a2dabe545b32c758c9fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous external URIs, many hosted on potentially compromised or disposable domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vetamblj.si/ckfinder/userfiles/files/74640265530.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161045686ac258---85500648612.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c978e7173f4---56527163239.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zofizifixu.pdfIn PDF document text
    • http://findplusltd.com/file/zofipa.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/6cn0l6r0vmsrs28kb7uhqafbj1/puxemobi.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/99130337284.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/be2e47447ae7f1e5918a65a8e4285ec2/nokirolod.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/89269755859.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/53582693195.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jufegojuxurefozo.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/76943251576.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e010ca63e---15637600698.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c323dd9c970---rotizijepumevo.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/78439583439.pdfIn PDF document text
    • https://congchung7.com/upload/file/tenobup.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/nakiwugozekarezapokuguna.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210601001304-pedubuzemusasuxe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bef3c694ae3d9e4a420be6687d1e12b6/bogaxujuxuwaki.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/94640369555.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/46702978156.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/37691088732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+free+likes+on+instagram+without+loginPDF 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 17472 bytes
SHA-256: 899e528246d293aec4a2f25dfd33b41de49cac855bb3439b510f9ab338541e19
font_01_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 10976 bytes
SHA-256: 365ec9687aeb1f6e577efa75f1fe91645f66abfd960475a73f5efe036edc69ba
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1