Malicious PDF — malware analysis report

Static analysis result for SHA-256 d940866f442f341f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 09:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c9d4d470b7789af36750c4a318fcfd7 SHA-1: d3fd24379093199bca62d624392916b31612a6be SHA-256: d940866f442f341fb01cec9064e04bb81ecd9c2405883b0d19705a0d03640e48
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to host or link to content, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://nirmalamathachurch.org/cms_uploads/image/file/83347612224.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/613a76661f2fed1fc0ce9abe46ed9c76/48954928551.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/66441688023.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79291547180.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341abd50706---fevevadubode.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/11270647794.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1341812315.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9e97317f---rugokapedunilogigabuka.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210913210300.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce9d44a4c---41888613515.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/xokalijejenujopere.pdfIn PDF document text
    • http://nktrading.qa/file/files/fadereduta.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/jupidovaruzadugolibebuvi.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/lovezajolukid.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xasov.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ladaziduwukapan.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1bec0faa387b387cbb49505ba5354234/suzugazagobisuwifigolatoz.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///bixug.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/levinufademokox.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kenorejofibisuto.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/paruremikij.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nudir.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/97811296788.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/tisofijixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+7+root+apkPDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10160 bytes
SHA-256: 6110c701837e9503300b6a0fcdafa17a71892a562dfe9aa712b9ef4ae1be72fa
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 17764 bytes
SHA-256: ad7ae1e215e661ab31dc766fe3f51235f7edef13967b0065a6f897b5a7a7b911

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