Malicious PDF — malware analysis report

Static analysis result for SHA-256 be85ccc5637e5ffe…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 10:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 686c3a60b9184e3a4a91a479068cda11 SHA-1: cef76fa5b9ecb9922c96c41e5554cbf7cd497df1 SHA-256: be85ccc5637e5ffe7dabde74f523131e9275e77459ed95b36de363a786ade8d9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to download further malicious content, as indicated by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b5fb222693---runuwowove.pdf In PDF document text
    • http://resortvillairene.it/userfiles/files/61141875796.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ac6edf1c2a4a5546a59c24d779b25a1b/23483323330.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/xawugozabelo.pdfIn PDF document text
    • http://nature-revive.org/files/file/tevotalureti.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30758888380.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/18a64c5f0c471c7ed89b3aa0e68f9f97/64859600061.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/75655391556.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/karevasavumelepezowotij.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/xedefinivukupub.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/20879591277.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/sigejujalakozikug.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/5135327030.pdfIn PDF document text
    • http://spakimthi.com/upload/files/4814021669.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/buwexo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/37287485988.pdfIn PDF document text
    • http://esistore.be/userfiles/file/xikarixupogojimulewaf.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/24252165568.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/67910377632.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403faa5424f---89247354253.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/wubemewawijizodujaxurun.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/furibewekusosaparebowajit.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/vevexulusijatut.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/31282820478.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gogofakevas.pdfIn PDF document text
    • http://rivucota.com/upload/files/pevijewuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+speech+recognition+for+androidPDF 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 17408 bytes
SHA-256: 8a2a1171ccc97ee81f4cd591e6aa859f374c4182de0daf661c987b4a207d37f1
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 10984 bytes
SHA-256: c468f8151ec79af1703819b456d240e0ee6b5fb5432dad7972dce31659e57bb5

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