Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75eef06620bc187…

MALICIOUS

PDF

78.9 KB Created: 2021-08-19 04:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6da33f3d067a35bfb754eba301582750 SHA-1: 698b8668a4dac2f2abb6dabcc8e5f0a394919613 SHA-256: d75eef06620bc187b53dfcc0fc710702d2ac73f8d7b24ef4ba176ac9b12b07ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a629ca83ee7---juwenatajoru.pdf In PDF document text
    • http://murasakijr.com/uploads/files/katonafejazafivozuma.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mapupogirifutep.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd27a8d2b3---xavudoziwavovoji.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/55640558774.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa302d16dc3---5518005693.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/62660780573.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/24055213042.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ef1158a9---zeluzodusowexojugibixon.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/54538792484.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/26573133449.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/volezulebafizuxuvizupul.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/noxopegareguwuzino.pdfIn PDF document text
    • https://fallsplat.se/file/99686255120.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b586cf1ab6524315bccccf6853f81ba/dizajudavonit.pdfIn PDF document text
    • http://all-premium.com/user_file/files/8728391987.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vsrm2pi2t5nretm26hm92cr1m7/pudolobuted.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/5044784212.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/698b71031c45b5edcb3511c706b01b6c/wuwezenakevamoluga.pdfIn PDF document text
    • https://area5srl.it/file/vanomidisusop.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/qotr6ttij3odcbaiv23pf5v6fu/wufaneduwufapedudafobuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gu%C3%ADa+conamat+ipn+2017+pdf+gratisPDF 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_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 11332 bytes
SHA-256: ebfff118e8bd4d09ea988e50d29a839a0bfb97a56d1a4d5f423238803a84e785
font_02_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 18128 bytes
SHA-256: 733a3c49e64a9e3e08b575b1a01be107e5859e0778029346fdba68a2e88d7901

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