Malicious PDF — malware analysis report

Static analysis result for SHA-256 3164fe2044a89da5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fcf738d85c68b86951d412df3e41c8a SHA-1: dfe284d23270144c95764f9bb403c7facff90467 SHA-256: 3164fe2044a89da5dae8fdc29577727dc37a29a2808ca158904b86cba11b7a04
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 phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611af17a7a229---44278949800.pdf In PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufefifujola.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/68773692374.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/526bda2258ef8fff1b7d24dd6fe2c5ad/39401547431.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nefofokuzuxofor.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/48596745896.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab08cd5d929---natemelajibi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8617f6ac76---pipesejegofafofuv.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/33710537404.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f71557cfcf2---64781189650.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/72621841039.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/lepazunozakab.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28f7f40c77d809c7345a5846d81ce466/27950625523.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9c806a050df5a856c27a850aff37f24a/punivotuxadapavi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39bb509992---voduvasesubawoxujusu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/bavasedusasi.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/81717538962.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210809_125619.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/92688bdc7892ee37ad442858f6f93ef8/ramanubukegojakezu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/77539434233.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef8d2f4b1---62077538070.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/18903940907.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/3750322489.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qm4c2g9hsu0bh6hvld99r8va46/kanubowozoxuge.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/69494151034.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/22aba888e58ae4dd33986719244f5745/55759549454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=solving+proportions+practice+worksheetPDF 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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 10972 bytes
SHA-256: 60aa8cb0aa16d178e330c433c8062f902056c6e9bf2ca26f45850ff2ab522f75
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 18872 bytes
SHA-256: 11bd9972cb78f871a03e36f0dd22e8677e98123fa5a7fc1a02ba4099926dae22
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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