Malicious PDF — malware analysis report

Static analysis result for SHA-256 5626276c0c518fc4…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 23:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c6d8af43bb98a7a2a61a2db5aba4266 SHA-1: 92cdd2b09415ea1e9e1d408bb95960091873a9d2 SHA-256: 5626276c0c518fc4f8d2425265b89b3f3556fdea2d57a551ca11c2991c484197
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristics suggest it acts as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely to download further malicious content. The presence of lures for payment redirection and browser extension installation further supports its role as a social engineering tool to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=coins+and+cash+rewards+for+8+ball+pool+2018
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6617adba6---47235438632.pdf
    • http://myxroad.com/upload/userfiles/file///12103772717.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/bijadepodolevakowogesame.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ba2b1a04---wujeloxafezidulazi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db75fdb2b2---bugab.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a480c5fc---budamoxivuxoni.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/3772267351.pdf
    • http://flomojapan.com/upload/files/zunusidete.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f5e5c90b0ebd304005e35263a23b6253/83648804735.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4789fd696d---97247166040.pdf
    • http://chiari-web.com/ckfinder/optimist/files/50491700430.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/69krdr2bp9t7g21mjr38titqd0/12844025848.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ed8cfb090b331d51f351f120d689b9b2/xadofumabefo.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/75ac6131ba848f89d5e806b7ecf26423/kaxex.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75d4d0bda---20707185676.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cbc4819a47e840b933f8abd4f09712e0/fofudoxoj.pdf
    • https://bouveau-consulting.com/userfiles/file/bezagomekapesovopuni.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1ae8651a27ac39091b8583f6a6f364bb/22827506735.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16086af610f5cf---juzorepuk.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082635834b33---89696459710.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ca9939ae305c98df1e5eb055187a070e/5170854481.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d23cea26---27313005046.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160756461122ea---rodugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9d.bin
1dc7eee95b2a88e31240000c3d705b4bfb34b4d48e2dc4eb464e5568e63e7a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11380 bytes
font_01_sfnt_off0001153e.bin
4e91df30be5b4bf59130ff267bd565e5661766bb5aa88b2bd6d34e4c6bfffda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 16920 bytes
font_02_sfnt_off00014106.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 16792 bytes

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