Malicious PDF — malware analysis report

Static analysis result for SHA-256 639bab2ec1028203…

MALICIOUS

PDF

174.6 KB Created: 2021-07-06 06:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18f5f697c8fd21e64ed6432f613f6848 SHA-1: c3b61306cbabe83563e94b914b3850f58776eebd SHA-256: 639bab2ec1028203f3b99e256297de327f011789557ae4567089dccbeb4acce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, such as https://inwebjor.ru/uplcv?utm_term=god+is+conciousness. This suggests the document is designed to lead victims to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=god+is+conciousness PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1aadb58e5ce7465a9eb01a66373a8bbe/7826699103.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/39085706061.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dff0c36ac---97011771265.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160959437df150---jovogavakejike.pdfIn PDF document text
    • https://artenika.pl/fck/file/bugaboxuzomisamalawon.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d672a7c28df---jolikuvij.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/tutivibu.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/dawuzuluvigerufexebatujis.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/23794687700.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eb1ca975---nozusinar.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609711d610911---48722081376.pdfIn PDF document text
    • https://polandpools.com/contents//files/rabavivonefumufupuz.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2a59d2649489db5e6f045b1d25190dfc/sopejajasemavuru.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16252664141514101839.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946be33ce41---lipinarajubiwid.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6b5d6caea2cb19deab536f24b5ac8039/putufirelemifabuteve.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jixexezoturo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fivubofeworalu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fijipewune.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088469b1dcb6---40849998062.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/mijagobija.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffca461ce---mipuzalim.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cb8218df---15319026475.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_off00024c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C17 19872 bytes
SHA-256: 2d06cc419b6527cd23d4da98627d0af29e08ea67641519e512082fd5051bfccb
font_01_sfnt_off00027e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29636 10096 bytes
SHA-256: 9044513fa7d1af2598128ae2656caf2f18666d3e0206cfe0cefd1b3b3cc63110