Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cad05c65aca3b2d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 14:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6ca25bb00c84bc90e78b3e4f8f53e05 SHA-1: 9a52a687b790c25eebe81ddc221c31129fad2b55 SHA-256: 9cad05c65aca3b2d402abe6982ada8cdf5a9d49fb01b0ba95d56ef0a62b5f8ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirects. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://thuexe7cho.vn/upload/files/7715495205.pdf In PDF document text
    • http://www.halpellet.hu/userfiles/files/90365897682.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/xosuxeganekewubevak.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/51543524368.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/65690779466.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/82064693312.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/kikopefodizoneson.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/35514795174.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ccde225d5fc5fdc1dde74bc592353c08/2962165647.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/15742444853.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/73447981922.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sujib.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/fugirigoji.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/28493506170.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vekajuxal.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/jidamojitewenokobixe.pdfIn PDF document text
    • http://innersolutions-uk.com/file/96009486829.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161406a351f744---46146644988.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911181918285801jtiw6i.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nobufuzeleler.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/dijalapuzutakizoraxojoza.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/xemotarederi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/74dfb9bbf6bab22db081483ee9fa6c9f/duvofubazawozilezowozosuv.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vaxefelobibifajegabaxit.pdfIn PDF document text
    • http://chpcentre.com/files/file/gizek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=enterprise+asset+management+jobsPDF 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10804 bytes
SHA-256: b609c181090108d7d35a1010ec5f7500d93de8b4bf311694fc9298feacb16f36
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 18204 bytes
SHA-256: 928c3a169c7da4b5e7be25bfaf54ea70a4d7102392a886fde15f685aa4f96c88
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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