Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc32195c460b58a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 03:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 205cb84f689ba52552f4682671deb4dc SHA-1: cda2c213dd2b0210de01f53236eb8d7647517d45 SHA-256: 0bc32195c460b58a3fb091eed996904a75c650457c3ceafa6962e081e239da76
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a ML classifier flagging it as malicious. Notably, it employs social engineering tactics by presenting a fake download button and luring the user to install a browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user trust for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dhins.com/testingsites/advantage_aviation/assets/media/file/tagewirefuvibelize.pdf In PDF document text
    • https://valleyrentals.com/userfiles/file/24570306482.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikunires.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/lovowedife.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/66047184764.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/30079730100.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7c5ba7c3614ad2dc7910b3f75539e2d8/wetibovukogametemogapa.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/besojitemibadizegesa.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/derepide.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/80708035999.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fd377f4d---zafiwuzak.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/95247342566.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/93121351567.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/bitulov.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vojijubepakat.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4255c8f78---66774719648.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/jujawufiseguwide.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/85365798514.pdfIn PDF document text
    • http://roocenter.ru/upload/file/57521279626.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/jawulawezopijiziti.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/81945974347.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e6d2cfb3b31fd3501e696910f19d0f28/19677173007.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/zinoforilarizodi.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/muwewaxibazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nordpass+mod+apkPDF 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 10148 bytes
SHA-256: 65eb1e88a15516b51cafd90a6d0e3ee9a5a75722e52412843a325b8deee34921
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 20688 bytes
SHA-256: cf725137b14c638f46fe6849daccc5b2843789bceb46ebd0b2707f8e4862d8e3
font_02_sfnt_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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