Malicious PDF — malware analysis report

Static analysis result for SHA-256 9948ebaf176077c7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 03:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 460485a46eb86fb6a0084d6eb0c4d384 SHA-1: b191c41b175e478e6f2b74b612e6d70fe730a3ac SHA-256: 9948ebaf176077c78b7ce662ff2f2b72b46e955bd65b4d66b4b162a517c734d3
184 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 or disposable hosting. The heuristics indicate a link farm strategy, with some links pointing to WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=iphone+to+scan+qr+codes PDF link annotation
    • http://bigdoughpizza.com/uploads/files/65487688775.pdfIn PDF document text
    • http://partnercable.com/files/mamubenekonaj.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/82033373063.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/rujapazinowitotutirozeto.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/tururewadupowipesa.pdfIn PDF document text
    • http://apsons.eu/files/file/2591135821.pdfIn PDF document text
    • http://cecev.com/stockages/files/sulowexonuwawepuwizanover.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff1ebcec---silewokozebabanimabipa.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0ca4kh5v6n26mrdrhthgh23ndj/gegugolomuzakizevuzuneluw.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/firepijogigavunepotoga.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/taverukaje.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/nejujukas.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/zirovu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/77747827802.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/25718554605.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/vusumaw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ef19c83828639196a78e7e057761e417/muzilotewobufumomegeled.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/96656253522.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52261765026.pdfIn PDF document text
    • http://momsystem.ru/public/file/24825207990.pdfIn PDF document text
    • https://zagi.hr/files/safogitituvupazubigukero.pdfIn PDF document text
    • https://jobtiara.com/files/files/kovogele.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/lobokuwodonepibedala.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/suzudekomorabitos.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/27438124342.pdfIn PDF document text
    • 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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 18064 bytes
SHA-256: 1073b8eae8194673b17f968d0788c61879a37c8f7bc29368f49d513e8c54841e
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 10568 bytes
SHA-256: 719b71aa1c1f9fc442a11dbe5a7c512fc56fd90cd47c3270fc5599b9447828cb

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