Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccbbf154dcbca5c…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a10a6a86f79d95841f168584e69e3d0 SHA-1: a0d4eec77c36d6a01f44a43b73a18bfa0da9dfab SHA-256: 3ccbbf154dcbca5cb330cef62dfd14422ee7867f5b381ac5c2b46729d1ba9cfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly suggest a malicious intent to redirect users to harmful content. Although no scripts were directly extracted, the overall structure and URL patterns indicate a phishing lure, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://haithuanphat.com/uploads/files/ziwurogotosigiduxoluwaxen.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/duxeduzexodetoki.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/7318455650.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/34ab0eb84aaea64ae7d13b38bdbb1aa5/xejupuvozigal.pdfIn PDF document text
    • https://wonkingchina.com/d/files/mojewepananag.pdfIn PDF document text
    • https://salonrewards.ca/images/file/golaxomisizukuboxepoxa.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/19254007754.pdfIn PDF document text
    • http://dakov.hu/_user/file/89361514440.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/dunipatudoba.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lagizawetodenevivumonuset.pdfIn PDF document text
    • https://semut73.com/contents/files/zijojexeputivin.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbdf97ef42---54284497172.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lafezanesafirotugakukil.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/xapabozigurus.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/3892354056.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63840684849.pdfIn PDF document text
    • https://eternalbliss.net/file/80391159046.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/24750582441.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/72019872626.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/91715635405.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c7a00e342369e3bd84188bf3e1422fd1/gaverudavazuwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=job+interview+questions+and+answers+video+downloadPDF 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_off0000ac54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC54 15056 bytes
SHA-256: bcf81d87b83678c9770ad0be6e9f0c4141370ed00e70dcd53a94e8806cda75ee
font_01_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 10772 bytes
SHA-256: 62aa788db5cb319a748d1295e0f26a5435095f3ea58cee2b8f7da8dc7cb9977f