Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eb36bdf728def3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-15 16:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 534d93478a0cfa0a9d011c1ee596acae SHA-1: dd0bc5b8e74b9e6384ba69e02e650b9d981bb9c0 SHA-256: 24eb36bdf728def33a6cd4ec8c319b1317e98bd3da4972f1a9c00f3b0f9a94b3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as a link farm on disposable hosting, suggesting a phishing or SEO poisoning attempt. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://seksdagen.nl/userfiles/file/jemawasikumalamorisatuved.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5957c41---luvaxagobujugigofi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/80668559045.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/30351068362.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/23347434284.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514868eb78---56981455636.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/090722289375.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/wezuwirududedenamoledetif.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909092626.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tebamizujazidugop.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gexifisetezobeto.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/rolowi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/temijosu.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jexuzirozakeg.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r5qrn371vrpiuf1uqa7k40jq71/fumiv.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/95023901219.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/86795815371.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/vositivaluxalalokif.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/57872558933.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/67017054317.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/69229868149.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/99422173545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chrono+trigger+snes+downloadPDF 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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 15560 bytes
SHA-256: 225b866c07df7d344f4b20aa12084191811136269e34253d4707ac6c671308d0
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10644 bytes
SHA-256: 0dfec40fd0a75dd226cd0570a7b8f6c0c1780ffa117cd71115250aa4a8ce89e7

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