Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2502bb4ebcfd7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 16:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf9a32185f494f9a8c326cffa140fa32 SHA-1: 82468d1e5022f89e71ca5455c2b40cfa80c2b6bf SHA-256: 3af2502bb4ebcfd7cb79e574ecfc7c8404f14c4814548e5b6a74312eaec8af9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=kristin+hannah+the+nightingale+pdf PDF link annotation
    • http://tajeer.co/userfiles/file/nojosobobelevaleduxub.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/i6hd8ah2a0mhkor2jpb9qclou3/80232822257.pdfIn PDF document text
    • https://combrooncom.com/contents//files/99317072916.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/23931405263.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/60976131876.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f718b2914d38e562bfbce2f0017953c6/kemufodaxogaj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec88a1d7cf---nizizip.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160733ca1505cb---sadekajab.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0d92ea77---2666762732.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/vikevenadurofewamaz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160903373a958d---1289975764.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/79337955843.pdfIn PDF document text
    • https://lapiadinafelice.it/file/rikoxisolakirom.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wixote.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9fc531a08e489f55b66a568dbc91bf01/71808164061.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c43077e5530---danakebu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6bc769795---lodigelanisofavewama.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/43266881906.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/xetukevironurevilenim.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/90172507463.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xipekejutiw.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c40c514b---rukoviboxasoxokusafovok.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c49d51d2d---97610179911.pdfIn PDF document text
    • 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 18364 bytes
SHA-256: 2bcbc92eabd4deb25360bad8d13e604d30e514d025df653c2e5bd9211d9e4474
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10648 bytes
SHA-256: b879814a5928d67707218aaa7ace2573213c73131da6e81b21db557a6a5c5d15

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