Malicious PDF — malware analysis report

Static analysis result for SHA-256 e505d8fe9bdb850f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 05:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: deb693e0c1ddb66c9170b2f131e6a183 SHA-1: 5eb27c9a1b63f9c00c5cd05b9487567fae8a511d SHA-256: e505d8fe9bdb850f93397a69c1cdd4fc2c74de0b0f69b550848514c3b4eafe86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious websites. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct the user to disable security software, a common tactic in phishing and malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://synerhu.ru/uplcv?utm_term=worms+game+free+download PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161341ca9b2e4c---lomevawutamifuwituj.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mawameniregixen.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tejaremerugabenoripulo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bolupoboxukotufokomemenew.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/24042072715.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/pasodef.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136018aa5034---52701704589.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/32932015918.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161414075acebb---gegabaxatol.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87007412907.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/bakurodejivonakuwax.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/84390943782.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/55976732673.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe5c14588---35194179856.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/zujoriduwo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3deaadfb6---mivisuwuvemagon.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/degurafibekubafigode.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/88953006813.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/tawumepuruzuve.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/22177978848.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210903235628.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/gugolesaf.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61f52687cfbfd8c5b113c2d819722dbc/jamemesenekapaw.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_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 18156 bytes
SHA-256: 894d5dee8ea785a7964d066cff7a4072e8da7ea29b9dae257dab00c93ae5bafb
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 10584 bytes
SHA-256: 89607dde0098e39b8c751c0ac24f6f04cf8ec8e826bf6d0d273ef9105f08b4f8

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