Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8743dcbfbe84acf…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 15:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 70afa5f7148c8d75c7d9a098f6c3668e SHA-1: d4bb624720f5e0749c25756acf713479816d84a5 SHA-256: d8743dcbfbe84acf9d3fcab3c8c01d3722255584cc093db6ec1c163f9aba56a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These sites host further PDF documents, suggesting a multi-stage attack designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jccmoo4dte6at7afinia85ipq1/tilobuwivelorofade.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/76a555cf0d0382dc6ef711f28cf6d58a/93536078280.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/28584b3a50b987c729353d5886bdfc62/86603195849.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/5jtnnsadcgkscps04hg5hlrncn/27970829415.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7c60e859195c305e8b2c0bba9270d332/71354029220.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/1343282650.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160829c48e4c9c---ruruvojowaradukixebagaf.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/621d2f07c668f73be4b26e924f827776/4982878820.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624133480.pdfIn PDF document text
    • http://boxethai38.com/upload/file/36242164013.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20676622316.pdfIn PDF document text
    • https://aedwea.com/upload/foto/31247176147.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/xutejimimaf.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbd24946b---rosoguv.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kdo31bn0m3a1dl16m95dvmu1n8/32330465034.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1a11af991f707b6315671374ae488435/tanudijufo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a40e392053d11dd555b9d7e52090b4e6/90286578776.pdfIn PDF document text
    • https://lemanssrl.it/file/99736981219.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e01bcdf45---meropamimafesemiwa.pdfIn PDF document text
    • http://veivel.com/userfiles/file/85620387788.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/82491985304.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609210765e126---vexuve.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/im2c7dcrs8qiq4tn4qdcotgdsf/jazazenal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=8+year+old+boy+pees+at+nightPDF 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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 16992 bytes
SHA-256: 7f06b0b7c7c09282dd2064766ef5653ef968aac26f6d6aac13179dacf44676d8
font_01_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 11036 bytes
SHA-256: 08d07c9232a5c86b2b3ea71e166d671222ab77ef7047bbfc1cef0b6fb03ba9a6
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1