Malicious PDF — malware analysis report

Static analysis result for SHA-256 2302e41a6eeec5b1…

MALICIOUS

PDF

94.7 KB Created: 2021-08-10 22:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b503c6825c185a7a3cfe7b6ca98bc12 SHA-1: 15f5a49e35d737ceb731162fce8734cf8aea9a92 SHA-256: 2302e41a6eeec5b119418325ce687c31f126b501d03af523ca2555ab584c598b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/efuodsj3b7013pr6m9v6ah0qsh/25806655118.pdf In PDF document text
    • http://artside.org/data/temp/file/medizazikakixada.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zovaxasizewe.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/76441295849.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a646880ca0f---15773457620.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f20cdde2dd1---tadumibujajugelowazox.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/fisaropumubax.pdfIn PDF document text
    • http://4bx.pl/public/file/suvunilurogakug.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/diradedatejaro.pdfIn PDF document text
    • https://tessuno.com/upload/files/60cb8b5d18f26.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e94cbf7c6d4f1973d30b43ae646c9da/nekubukix.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/xisatezomax.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosuvofamunipufafe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd4512e65---31194170777.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/492438993.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/54999112651.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3e70a56c5db06353c724aed63ec0942e/27743198047.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/gabiferatevovoxoduzazek.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/tuzerupulesejixasuwotajer.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9ac3b1ccdfd3a39c4bc6769d7c73e9d0/64804390358.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/gigotenewirogawiboj.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jozepopedok.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4281553f51---fewesetivezupexowom.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5089d824c84d23e1b27cb3a20f12caa1/jiwewinuxeraxudesu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nukizugagad.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f28f6f6e4---15617267791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+spelling+worksheets+year+5PDF 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_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 17564 bytes
SHA-256: b5d6d24f0f309d9cd3c2a9ea33f0583df6541920b9bf082b67d74dcdc545ca7a
font_01_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 10932 bytes
SHA-256: 12165e32c366480f7534c871f4deb4c2979392b02ee1e7a29c0e1fb83f6cf209