Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcef4e98be7c7ad…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 10:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 779cfac13ca64192d09036d6a00fafad SHA-1: c17213690b7abf054dd21a30610acc36fb4dcc2a SHA-256: ebcef4e98be7c7adf4d137d6cc349d01f2a45257a04f84746d9d6934382b3735
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nwdglobal.com/ckfinder/userfiles/files/98169393706.pdf In PDF document text
    • https://classoft.ro/userfiles/file/xebilovikep.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rifizavunuwow.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/48485915388.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c407ebefd---jenovubumaribilozali.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfeb74b3d7---xijababubenipi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/2572748089.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/10117098447.pdfIn PDF document text
    • https://parkettworld.com/upload/files/forewokuna.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fd34c8311da2c40f5bd4c74b6d023fe0/fogegeda.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145551414cd0---79807183091.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/82lng6c54p4vktuv8u7paji374/gisij.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210914084948.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///38256087760.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wamuleradopolemuvimitasug.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210927_A98E66337A6412CD.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/pawefuwomusi.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/52094361462.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/guzasegapuv.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3b4c7aeb0---53973735141.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde7144b16---24414182493.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/56416455310.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/24645752864.pdfIn PDF document text
    • http://opersan.com/file/4549138429.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc12b3376---93992529339.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef5e67b91---sasefekorenufiwaduv.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/64699241480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+download+an+app+on+a+firestickPDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 15992 bytes
SHA-256: 20b1476da33b2aa57d59685aa631b6464b0c731885ae0a01259ef17b3b60b14e
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10784 bytes
SHA-256: baffb46b2a18f159c45b4e4e6a33287f2be72541af80314ce3a70e5b5345c4af
font_02_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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