Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee5dca58df3f68…

MALICIOUS

PDF

93.9 KB Created: 2021-09-08 06:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7f8bf5fc32484d86adc1daf8a25f5cf SHA-1: ed3c28f052b1ac76ab98e14b175fd7a2d51d160c SHA-256: 65ee5dca58df3f6888adcb66bc5c9cb19bac4c7999fe7595ceabfaf7ed9f6efb
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and a raw IP address, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple compromised CMS upload links suggests an attempt to leverage these for hosting malicious content. No scripts were extracted, but the structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://skiflogistics.ru/userfiles/file/melonuruzonoze.pdf In PDF document text
    • http://k2plusinterior.com/userfiles/fitipepawokax.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/ximote.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16113a1d1d3157---46328687218.pdfPDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc394e00c83---95412573924.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081220c81a1c---sexibajuwu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/43417100609.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf24130d983.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/76900244746.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/86b315fe86457a69fa74bed22018e77a/fuwoxi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/35d0568a0bd189fba2ff407ee0f074f1/84132965257.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129f212dc7---zetewisafabak.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b94f27b8d1b2d0c5b42957634b12bbb3/86501981249.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/24431541402.pdfIn PDF document text
    • http://packturf.fr/files/47598739674.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/196789359.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/23d6081eb91b222e761d23a5d6eb5368/66364074617.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/df45127b00a8fb810e8430e8e9926262/sumal.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/kakipeletisu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/xunutojo.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/zunuxadafuligi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4641791263dc1afc3ffab6614940dd7e/nuxejitewivununadusobi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/78c4b10ceab07d1a45bd2a37ccad2eb0/78535191043.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joxexewimivobatebodotunu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec7766b77---janetovojafusudotajoda.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/54b0ffac8f0cb508278b185234fbcf70/dolenuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beechcraft+bonanza+service+manualPDF 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_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 11020 bytes
SHA-256: df0869220939dd43da7035636271bb1902b066c581ddc8e4a8fb785ccf6d8212
font_01_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 18908 bytes
SHA-256: 24a7b55c9f688f8c8186b1a5a7964a1e9a3a3184b3782f650d94bf8b75cb4b6f
font_02_sfnt_off0001519f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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