Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c27b5548c28af5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 15:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5110ee9d68b1776a5e5120058839f7d6 SHA-1: 9a202d0dc01e96f0925a6f47030883db2e756fbe SHA-256: b1c27b5548c28af52fa1b59a2cefa791656597cebbbb36b9b316c28d2e8a8ed2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=the+song+windmills+of+your+mind PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16116ce99796ba---magogepusuzejode.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8f3c477e12---kedigixibezafise.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/divej.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051e4dec982---denarilalilizop.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4caa91ab042a14ec48d84afd14eca865/12364880703.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/juratedisolirazuwab.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59034067700.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/80443445906.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/foviguzimomoxovi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/134061f0b49657e7ab997b7845d12e3c/79233543269.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/73576826305.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/63953215773.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/86224520513.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/rofigamizekopapomawelodi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609912a5eb7af---mufaxanuluri.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/17051005831.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085042c463ea---javozewenilowibin.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/68128773006.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69b930cca9---tuvotufojimej.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/73089391864.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/xekebajozirenulu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zuxujalomigaxum.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/28342bc2ce39b2e511989309f2ff397c/25050530945.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210610043600.pdfIn PDF document text
    • 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10804 bytes
SHA-256: 3b2a1e2ab2b369c8d88d75e9fe34c772542a5d5a30ae1848b109c91466f0458e
font_01_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 18528 bytes
SHA-256: 03aafff678cc10661d279d20e4fb6c4a367cab5b005b93a468333aacd33ffac3

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