Malicious PDF — malware analysis report

Static analysis result for SHA-256 19841f98ab17b020…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 21:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26ef05ec501a39a18ac8ca21d61c7d49 SHA-1: 3a7d0610e5d1a3dca1fed7c4cdace1b7f0332659 SHA-256: 19841f98ab17b020a38a0d4e429116b0ad7ab2b4831171c8328a134c3012bc2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac1fe2415b---68463697389.pdf In PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/doxozuvetin.pdfIn PDF document text
    • http://christopherdallo.com/file/gujivipekipulimo.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/fadaziginamefoxomu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/54750573328.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c16ca62dbb178331a76820b47d2532a/fuwovozuk.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/5020407135.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5de4e7e1---5757959838.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zogetomelakojafaxilusag.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/66905992221.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/romomilolezusuxidozod.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/manuzi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609580ccd72c6---pisizajivivubirutatetebi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a60c287e---83708445870.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jeketipugaxivex.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fumuku.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/78842239370.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/76100738059.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/zitanovo.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/24165397195.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/zinuxumevavije.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/80750056026.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11552466863.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb9e02c48---9457317002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transformations+worksheet+grade+7PDF 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 18796 bytes
SHA-256: 971b5cb0450e5d2f2558ab2f83efe2a674190a7deca9d856b319fd2daf7b0987
font_01_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 10944 bytes
SHA-256: 7786249b57e4640f6a44c90863b259b5c312c8fe764c61553b531592b0097b44
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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