Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b586ee772645d90…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fec8352792964a1dee8bae7ff52528f0 SHA-1: 46b52c2d47d692ee6281242674f222453598695f SHA-256: 8b586ee772645d904eb3d769a9460321b1ad3cd16cd9335c5846623ac06037ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://confidence-ist.mktechsol.com/ckfinder/userfiles/files/sepuwonedeveterod.pdf In PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/21137579984.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/46529879727.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/38328682915.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/7062442565.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/30051141030.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70007878798.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc0d3f0daf---lexojujafimajupagewe.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tikepirunabifufamalik.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zuxarusobodiroje.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fidiwimogesisupolezivez.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/96666265675.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c72539917f---xemidoxokewozakux.pdfIn PDF document text
    • https://tarsiman.ee/files/file/24913218182.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613053ab1ff31---wawiwig.pdfIn PDF document text
    • https://pmms-online.com/assets/file/teliguraranulebo.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kimabomevugazetirijuta.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/99308778924.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/73469209305.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jezus.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zisuxoxega.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/61361955367.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/51811127059.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xikawuzineleriwifune.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/462125043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=911+operator+full+versionPDF 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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 17400 bytes
SHA-256: 81ec8c39b64a241dec8d7c5bf2e81a1a0c6a109721b91320965e0f022653cc28
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10640 bytes
SHA-256: a8c40bfd6db6e2c16819cf332aa57e86796ae6a28a2ca00e699962810fdfe0cf

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