Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eba5db27e9a0d5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 10:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6873b40c19289129d3c46653e69017c7 SHA-1: 16c609901fda69a5e8b331769502074b48bd4270 SHA-256: 73eba5db27e9a0d5482509f1e44f2a8f5b3ff2c0ab68b22405df569b8fee2800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://shipagents.nl/uploadfiles/file/vopidumoxuk.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hdhqnv10q4kvb11lc5molmt0i5/jelenivu.pdfIn PDF document text
    • https://tele-video.ru/upload/files/58216110539.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/ralagesefexafamemosibusip.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207d841722---romarovogo.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/24125357524.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a938f26a33---kujavupepaxezalilap.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/84020389693.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/mewetezudikonifari.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ae447195---digawixosomisavolota.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/xibubemujuvupedoto.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/padafupigavulatusujefu.pdfIn PDF document text
    • https://onlinendttraining.net/files/fedofarasifow.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/gakexur.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/6593194935.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/bajivajebupome.pdfIn PDF document text
    • http://rsentco.com/upload/file/mevadovasodewavodofaf.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/58835963180.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d9adae73f5ee6deb7f8e0b5da1504f2d/55938474642.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/19398769218.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210916035117591.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/89697086114.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wekonerumevale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+tablet+is+slowPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10448 bytes
SHA-256: 12cf41ce1b8e120e3b6f61876d0b48f6f8bf43ac4274ebe6186c43a68a3dd079
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17652 bytes
SHA-256: f42484ae48dfdc5ff3b2be0c69c3803c695902d906c495a8ccd6932016dbaefd

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