Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f8947d879cccb4…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 15:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e50feb53ee15d01b1f30ec0632b87c3f SHA-1: c24b3ac3e64cd5447ba72ca76cee9958991e49eb SHA-256: 63f8947d879cccb44c74601342c2bf0e388bc8e2184a007de1552d66bff564d3
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 http://itemclinicchina.com/ckupload/files/86750867859.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/jutipivusibejiforiba.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/degazipuxogovawemebivobe.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc89b6c6615---8972517524.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3qs5u8co4u41pbfjrgfi4aeifa/getazidovugubemiviroridi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbb08168f---2090035587.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/delipesum.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/73188274283.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/27375121988.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4315c157d25359b3f6e5fc4a8e567f21/38195212740.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datuxijesedoroko.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6e20fec55af5a2c15fbd7156b4fc8dab/peperosoto.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/34498680909.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/33545609232.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755eaa6dcf---bowugaf.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5fc7f388eaf3bb0ee35551dabada7e2d/rutefawini.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/xiraruzive.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/28489791858.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd382eb6d6---97210494442.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c483bf709a2---90011828726.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/rabijiwujam.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22a70b8ff1---23633053404.pdfIn PDF document text
    • http://premium-t.info/files/files/wavofikivexopow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pass+gotranscript+quiz+2020PDF 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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10996 bytes
SHA-256: ab0b0c2449a5ebc3ab1bf646f61777ef3d7dba2620012bfb09c752a4a47167ab
font_01_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 17896 bytes
SHA-256: d56a05cde8e0f1fc8e7f16fcf651c9c3cd82dbbc1e40ab832c17885752e941b8
font_02_sfnt_off000141f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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