Malicious PDF — malware analysis report

Static analysis result for SHA-256 399af1af4ef82e91…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0c4e7d94efbb08c10ab925dda7a5768 SHA-1: 247866d5a73d98d526d552390c3dee2ee4c8e531 SHA-256: 399af1af4ef82e917c3c5e754be8bf6fc652bede0a7ce1a821e9c9b7d5a01ed2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://irlanc.ru/uplcv?utm_term=hp+slow+motion+terbaik+2020 PDF link annotation
    • http://farmaciafasolis.eu/userfiles/files/tofadutezukawasuril.pdfIn PDF document text
    • http://belean.pl/userfiles/file/6528966960.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109011043139582.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/lefatux.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/nazuti.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/zejujiwes.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/53622175024.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/1433618389.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/6369321346.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ef506174---77623080235.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/19938991900.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1470796ae---54113712838.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91831835841.pdfIn PDF document text
    • https://teamcode.net/upload/files/88122660930.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/49592481395.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/74997203008.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091614102673499.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/62720603809.pdfIn PDF document text
    • https://umutfm.com/resimler/files/7370146179.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139c021a2799---bibusopo.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/97467546759.pdfIn PDF document text
    • http://someteme.com/archivos/_20210905061336.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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10964 bytes
SHA-256: 8b42d30e2f414d5600d985e0e1a766abf16c4db88a6a636d459f907e7d059702
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 17904 bytes
SHA-256: 3d804979ad79b885ef21af49dc91baa9291a1858f32f69a86d0fd20c4c4ee77a
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1