Malicious PDF — malware analysis report

Static analysis result for SHA-256 e785e6a0562df8f6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 21:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4c2916af59b01c8a734ebfbb1fec176 SHA-1: e34602edaddda44d6ae9bae7060c59bfaab5f208 SHA-256: e785e6a0562df8f61e6597ef6ff34c64052e51a265c5c56c516314a16803e707
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results or user traffic for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fc69cffa3---gaburojojezitimafusor.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/kubetinimunuzixapu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f92321e33eb90cf013b36dbca956d316/93980680057.pdf
    • http://langeline.com/ckeditor/upload/files/7490749196.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fuxalibojijizepaxowaxafo.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/65517134000.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/29a1e44731ef41ab6de00c06150dbb02/xixavisasujexifo.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac0df7aba037a58a573ab0a8bd81fa29/galamosivifetoz.pdf
    • http://koszyczarek.pl/userfiles/file/gawiripesomelipe.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b17539be960d7a269bee76f48697b2ac/39163105288.pdf
    • https://bandotrading.com/uploads/file/52584347037.pdf
    • http://penetrat.ru/files/files/boxowuludaralekivopo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c182f2493c5---gomowusepekijezujexur.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/711d5da2a84c07b7a4ef10800e1dd90c/15739600389.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/lazuxipefopofu.pdf
    • http://rexant.by/upload/editor/files/64111412081.pdf
    • http://amandatravel.com/userfiles/file/jidemiwijurerataduxorafi.pdf
    • http://aliglobshop.com/userfiles/file/91588999845.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611f81013c3d4---vujemurobugatekugaj.pdf
    • http://inimtrento.it/userfiles/files/fumodexugolarixuseraleras.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=que+son+las+corrientes+rusas+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16792 bytes
font_01_sfnt_off0000ee0a.bin
b157f71d75ca510335da73e084357d6def0aeeea8d869584246204e5187b7138
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10772 bytes
font_02_sfnt_off00010712.bin
ddc0113d47d8f99e0a7c9643ff165f157c6d7d138095709a227097a1decc142f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 19500 bytes