Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ddceace255a9e6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 07:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a774815564ebe4be3abbae51be03bcc SHA-1: d6f7dd7406616d1652aef0b963f6a0408d497d6a SHA-256: e7ddceace255a9e6565b363d7bdcb8b4ab99baa08e00a95a17e02f7ec93c4003
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to redirect users to malicious content, as confirmed by ClamAV detection as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071b523c6c67---70305643540.pdf In PDF document text
    • http://meghdoothsuzuki.com/uploads/vorofoboza.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gsdnn4knsqvqq0ahk58n9fibh3/74895155652.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/22487034686.pdfIn PDF document text
    • http://gibisch.org/files/files/barujobabuvixunezowus.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b9840289b255d77793986e803017cdd/98539073268.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/52158921555.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4cd784dd---7857063345.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f9650f62e---mibunazapuzer.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5573429c0---buweli.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/takudifafasadopaza.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/72904110001.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a4cdac73---wotimujibetupapizu.pdfIn PDF document text
    • https://clinicscrm.com/img/files/rolewevubujexuxarozedi.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/ralusunatuwalola.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/suzezov.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/89941692170.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zitoritosujariziminibewow.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/27211846396.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tabufixujifikofilivuf.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bekiduna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=words+that+rhyme+with+gardenPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10840 bytes
SHA-256: 3040d35da450d1299fcaae6b0529d4703ce654d9267070bdc65bdfba2475d10c
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 18524 bytes
SHA-256: 5233a8274af631f659b20caf2cd692cd688a9f5eac3e072fb44d3b7bf0455d61

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