Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c99d60f4e88be3b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 22:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d0377aefcd33e5be98f33b8e943e846 SHA-1: ab4d4b429840ef9e2ae549dbceffce25e5deadb8 SHA-256: 3c99d60f4e88be3bba45fa926dcd97047cc450e28fc23093d33f118a2807c4e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content. The presence of urgency language in the document body further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://my-natural-style.net/upload/files/65686624065.pdf In PDF document text
    • http://axwelindia.com/uploads/dibilefo.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/dasizaki.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/89b30005e520ab7d97333cb59c50c91a/40351589985.pdfIn PDF document text
    • https://proia.bg/userfiles/file/60789510779.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/malimapumekipofexulusumer.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/16854967943.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d799a48a92a---78822969617.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/63a8880a954093b8b9370bfbf5129e8d/55313048427.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/91776796532.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/90464893249.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/92975003569.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/loduresoxebakadugisufezo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kuzelebewewarudefaxigagov.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nmg1c225utqnhiu19kbfvgpi21/20209009873.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/96604119615.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/77fnthkr5567a210avirqps20q/22558196975.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946ea811985---57233560206.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/70033549197.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa515388a8---23442207938.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e418af6045631334c6a9de15c9c5f440/50636012807.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lupujujigigilujopugefex.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/55603818948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=beyond+self+actualizationPDF 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_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 18344 bytes
SHA-256: 67b6886462281e3b168826080e36388a36b1d2c8b13e7a58aeb0fecd15619f51
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10696 bytes
SHA-256: 26077d266e6f47aeeecaef9b7210cf09f59e6344a70e4781b8731138034e80be
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1