Malicious PDF — malware analysis report

Static analysis result for SHA-256 edea8421a368b841…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 08:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c350aecf153b1863798007e3608239f SHA-1: f9e4d577bd7402bab0fce794e0766aaa5532c59c SHA-256: edea8421a368b841bf2f81f1097eba0a3a6044d9ee4ff9795f516fc23ad30da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links are likely used to redirect the user to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2ee1dff8f3ca73faf4add35e17352959/beporufuwule.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/325b4fa79c34added13dc77fe7e1ee42/kamajevotofa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a01fd6516---lasogofaxijijodakofimul.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/51793694018.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/tojaromira.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/80914282977.pdfIn PDF document text
    • http://allasclub.com/campannas/file/76228622513.pdfIn PDF document text
    • http://toonesk.com/upload/zugetiwunanamurexekogip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074704a080bf---64180380311.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0c112dcf2---revedeloxegamilesur.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210521041012.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2ea2e71d8086940768a3166a1ab661f5/26296757876.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rv1sss6d4lpffdcu9cbibll8n2/rezago.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/luvugitejewozomitekurijo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/wadibibif.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4pp2f5vda40e1o4snofcpkjpt9/visifasiwupupoxifo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/ziguwozuvonovokojunijilex.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jikoxoxab.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lekatiwetasa.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l5qvefuc15f34bm8pkjstptp75/76676137190.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafc9f91617---26811298720.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/61916150898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=different+types+of+context+clues+pdfPDF 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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10768 bytes
SHA-256: 99b2c6e0b1e2838a3f616bd345c738ed2cd5e1ac3784e240b2ac3f8e788384c0
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16384 bytes
SHA-256: 6de8ca1d14fa67f003362b6c057b5f27c343901091d4e9a7a0d158a5e357cbcc

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