Malicious PDF — malware analysis report

Static analysis result for SHA-256 e305da6560295106…

MALICIOUS

PDF

92.3 KB Created: 2021-09-05 00:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4e55a2a30d743d64947486f31f4d410 SHA-1: ecad0723edbf017fc477fd31cd54351473f435aa SHA-256: e305da6560295106df82016805358b7a4c89746479aaea476b602570af3703ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with many pointing to PDFs hosted on various domains, some of which appear to be compromised WordPress sites. The presence of a 'utm_term' parameter in one of the URLs suggests a potential SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drlanda.hu/user/file/42663161935.pdf In PDF document text
    • http://chayka-svg.ru/files/93051467791.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cba4ac4219734ed1496c0267053125df/17704628073.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zowujuzuwed.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621211814.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/98611476714.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/362bcf502ba7636b8e7735e21956e127/97392288030.pdfIn PDF document text
    • https://medtek.vn/storage/file/xizusodujexilisasesupi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fe7452b0726684e79516ac43b6c0e82f/xenopimesipavobozu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0a67b5611d36c7da3aa76a392721e762/69552806075.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jalobobufirojelufufezis.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/vadofubaboxokipajufet.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jutafitupeder.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe484471c8---rigotujiju.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/18a84819700c82ea02d3baa5475e8ed3/kapil.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/co25kc3o42da05sm56nsrha8dg/kepufum.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/56273000090.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f11f9c06019---7954126976.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/23033371689.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0522a21871f37160375fdae494384d2a/92349948796.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/zegazu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54efef228---54345917128.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/subokoxiduzokagabanal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mathcounts+countdown+round+pdfPDF 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_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10628 bytes
SHA-256: fb5dc8c771b7300cdbfbd710005e33498d22a0fecd5abf1879a1be6762ac3f71
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 18376 bytes
SHA-256: ce27a37eef43f6fd5881598310f5bb9fb1d48cc6da0d62ad98b0ef5adccb7ea4
font_02_sfnt_off00014b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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