Malicious PDF — malware analysis report

Static analysis result for SHA-256 befc22836da457f6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 10:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6245047ed9f5d0d1ab45dacf09e937a8 SHA-1: e110db7bfe4f95a304b59d0053a78321ae9650c8 SHA-256: befc22836da457f6c5efb7782d3479fa29a5dd84dc4a3912d1323d744ad84856
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious payloads. The document also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to obscure the true destination of malicious content. The presence of invoice-related language further supports a phishing or scam-based attack pattern.

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.
  • 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.
  • 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://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k24o8et3smmicklbmudljj4fj9/35042161582.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6dcb3aad---tabogusugapaj.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3826141b1da570c02d29feca2c0882a9/polumedigavogeja.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/veweravinusuli.pdfIn PDF document text
    • http://learningkey.org/userfiles/nixugim.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adaedbb4a2f---vurewuxasofiziguvenawu.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/91385003326.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/39985310856.pdfIn PDF document text
    • http://ave-france.com/pics/files/gezogadorebap.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707455f98f---mejolilobarekif.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/datig.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e61c393c0---tomed.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e9bc24f1e---70314282865.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c8008eee---jimolotewo.pdfIn PDF document text
    • http://recviem.ru/img/upload/neripegemamatiwevarujiloz.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/18107312877.pdfIn PDF document text
    • http://teifsepahan.com/files/file/52095793439.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/morir.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/48512857096.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/81030941785.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/tufevalikarabi.pdfIn PDF document text
    • https://bloomeng.com/uploads/daletudatuzabo.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/melubonirubor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662fe678ab---37162098296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jcb+parts+price+list+pdfPDF 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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 17196 bytes
SHA-256: 0f1c1ea601cf3d29f0a2db21e019babceae3335b93604bb1e6b28a0e4d2f66a3
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10520 bytes
SHA-256: d4b5e7703ca7f7b2e62b347e1c0f8384453acbf7d919e765a2c159b94b571f87

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