Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21700c4c12921d…

MALICIOUS

PDF

77.1 KB Created: 2021-06-21 04:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c7772c98b624f686f244ced1bd7fcf90 SHA-1: 09c5e7ad0614a0803bc219bcc588f4236ca6b5d1 SHA-256: 9b21700c4c12921dc57811f5d8ba03ea9ace5cc6a3e1ab652600f7cd69865ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords like 'massage rub and tug' which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=massage+rub+and+tug+near+me PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086732706d6a---3036350550.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b0d0157c---bofowivatijaxavu.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/kalewurepuveroninibuvo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xavubi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a7596dd3c34332a0ade41212b8c050de/93642629926.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1fc65058---wazafawosadidajuruwe.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/74fcaf60fa5d59d0681e641a1012c1cd/85720123901.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/30284019683.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/6981985784.pdfIn PDF document text
    • https://efnnma.org/files/file/41358750312.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f9gat6ef5n2ngpk1rdu3t9rbh/jiziwaxuwedefidipa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ed576091---xevipi.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/zibekanorexiworuxite.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/gedadef.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc1c3a2df---33478901219.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38edf019b6---65681861146.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/donutigepokagakupidewuza.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711230dea0f---nipudewonewiwilixofanute.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/483bfe4d929f0b5831106806ae3e6de2/39179047141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5256 bytes
SHA-256: 00a44924e1a5db7d3abb1129f9ac940f86f3a15113c45cd2de0608060fedea46
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11332 bytes
SHA-256: 0e1201e0a8aa8e84553863f10f1ab4987db35a4f53dbd4c588824aa40a962372