Malicious PDF — malware analysis report

Static analysis result for SHA-256 5676b6b9f3c9ab04…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 03:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4889757c9f803a8590f4ea2731b20fe SHA-1: c23f19bfc120c4055e66525adbc05a842406c28c SHA-256: 5676b6b9f3c9ab04b97ad576556f617a6239727c9d442b00523d3634ca8a3d44
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on disposable or compromised hosting. This suggests the PDF is designed to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://silver1979.com/upload/file/musosoguvebedoxoteruk.pdf In PDF document text
    • https://lexconsulting.ro/webroot/files/media/67161529431.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16149082cd4601---56742819136.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/3973210326.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/33074527716.pdfIn PDF document text
    • http://megalaserasia.com/upload///rikakom.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/16695998370.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/10dc5b4ef204ee50f0b4770834a46a7e/lefizirewerofol.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/zikabivajonafakaxa.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/jojagedotuvu.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/levisikos.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/vimaza.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/593a8dee4e6465749d64090c4c99013c/xixinofexebila.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6bc855a3d72daa923ab4757bd1ce764/2970173917.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137edc8cc921---33711187353.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/jasadejubopuladepuji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161564df50d970---fabixutofimu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f51b6484c7549ef7135856d88abf82da/dizufizot.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/rufozijuvigo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/1930421502.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/dukowi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ui15008keiu61vagh3p0016ldj/sezigemuvumowudanen.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88468022031.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e9b06400---57396370430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+x+app+downloadPDF 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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 15252 bytes
SHA-256: 70d2b8cd9e30c1f673dc9f290ba2e6233c459ee0a60c23267b3b08759e586011
font_02_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10440 bytes
SHA-256: d1233ec18ac41e58a21bfe8db7d1b01eb59645598d8d852c636584d969501c06