Malicious PDF — malware analysis report

Static analysis result for SHA-256 def9bcabaa0c47dc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3b1e0021a86c30581ebaea0eb3314de SHA-1: 42ebef9049893efd699b0fe17fb5ac2e3a863b07 SHA-256: def9bcabaa0c47dcc0c8184b602f50d47185379c177e5eefd26e2fa2bab879ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://donkaew-furniture.com/ckfinder/userfiles/files/nawenebizosewomelijirusip.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/76630243076.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c115b08765---kagibuwobodamifovige.pdfIn PDF document text
    • http://epmachine.ru/d/files/55358533015.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vuzimekow.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h8iefuct6mml48tsrm87oc18o5/lozibexaxawaziwaragowinu.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/9676325526.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/5464417561.pdfIn PDF document text
    • https://avflash.nl/upload/files/janutubureba.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/17895419057.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/45738811407.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/92271108788.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/18929004203.pdfIn PDF document text
    • https://swiz.eu/files/editor/labojakejanakafiburivaji.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210906161709.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efeebd46b4---godudikapijupesufu.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/28805252513.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/puvukowu.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/2656498773.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4de1fe92---didorasukiludadoj.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/73540048129.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tefumedoru.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/fifelef.pdfIn PDF document text
    • https://claudiodituri.it/uploads/xosagotivozuverozipisiviw.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090808053173499.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9384816969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minion+rush+game+free+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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 10884 bytes
SHA-256: 40190d2518690fcb46a90f1ad46a3fb827eef36e1e1e8e415b213a5c8b4f9dce
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16540 bytes
SHA-256: 1376bf8bb2018567b2d06998a924b84bc8fe929ac882eec6b7aa8bb57f4e39a5
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1