Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe5d205d85cb988…

MALICIOUS

PDF

101.9 KB Created: 2021-06-26 17:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4cc4107775cd8814ff1b3b38511362d5 SHA-1: 857dd174ea37473f6d0e3c60b4c9f34b1e8e6ebc SHA-256: fbe5d205d85cb98810b0c2f26da8bbeaba61d5e2f0cd438fead8a4eb2f6a5946
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=off+and+on+sign PDF link annotation
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e25ae9071---45194173567.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0ed1fmcq726jhkcqbacm26isca/gesevix.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40f6f1d95---59393063252.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be557d0f8b4---tabozozesajekigivotere.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/11563192465.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/64050910039.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dunomumixumasinifowanisim.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d1beb3f6---fiwufexavagesefujokuta.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2327c57b84---jabejisemufulozusa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c6608fcfee9c566dc67a2c8ab319cecd/11192390967.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/23u3noevcgosokb7slk85i57pn/larepomipaselu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5a65402716ecabe57f08eb136e5dad0e/bokifukesobazu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e8167ae91121cf531b4db30ff20d1ba9/gosebabalize.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2o1g0hd0k3k3fdtgemn6totoab/22237046786.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/xapizop.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2b1f5ab581ce6f3b012e85187d6da461/75798756207.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d93a42fdc---xonevosidaririb.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efea368c28---47728995493.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25954601804.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9db34b11---kapop.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/085bf9f7f50c4f5b588dd2c3bde82b9d/vapurokiponigo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee5f11b3---nugugevoposiwivexido.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/19669268229.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/samotokiritibaxekav.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_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 10176 bytes
SHA-256: bfa661b8bbba1621341f261b641ea5ef97ffc558ecebdbec3a834efc65c3b0d7
font_02_sfnt_off00015a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A26 18164 bytes
SHA-256: 4bea8f5ac753a2a76364fd1a9ef14730b9947723f6a9d85303fcddff1e66fe04

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