Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb14a72cb9e8d2b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 18:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab6a30c56efbe3d390ed6358a226aa31 SHA-1: a7b9f08f19483386aded15a0f9f7451a090b5e78 SHA-256: dcb14a72cb9e8d2b27b5e3737ad7316008d229d2231f40a21cd992086dfe7317
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to various domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URI links and a link farm heuristic strongly indicates a malicious intent to redirect the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://artstudiodesign.it/userfiles/files/52801596249.pdf In PDF document text
    • https://shevian.com/images/file/labobujokosoboguni.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rujixuz.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/53218980174.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/vakukosemituworutesujezom.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/55461000994.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/91168477380.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/6109989005.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/92876048310.pdfIn PDF document text
    • http://dongphat.net/upload/files/tebojusunikozepemew.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/vamogujer.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/62273499436.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xixupirixerubelamugikoseb.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/43960153252.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/51355042504.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/37742299546.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8771b18d7---41499724158.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139224a5a770---bivekavozozetumawu.pdfIn PDF document text
    • https://stopserv.ru/files/file/61858950552.pdfIn PDF document text
    • http://medica-brno.com/files/butoxu.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/63367421948.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910235342.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d384b5e54---jipugivusuxujibevafufej.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/18007885239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=call+chat+messengerPDF 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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10496 bytes
SHA-256: a3927ac085bccd04392866effb1afaf673080c4c38da0e54d6b588802b6d1740
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 17996 bytes
SHA-256: 7f4193357e0fef7a84c5634470c1408f5cba888e11e112866b48da24209de329

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