Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ae13aa28a5a34e…

MALICIOUS

PDF

82.5 KB Created: 2021-10-08 14:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 495e441bad194b195822661ce75ef08d SHA-1: b7b5be6742997f718a8d32045e25035aa464992f SHA-256: b5ae13aa28a5a34e9d75f0c93aa64f3e18ee3324db0fd3cb92a0988dfe0b7377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous PDF files hosted on various websites, some of which appear to be compromised CMS installations. The primary purpose seems to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2086846b3cde3db7794082bafd821ada/tizisetenu.pdf In PDF document text
    • https://svezadjecu.me/userfiles/file/64877053311.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210917203830.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/sibasosogewavugule.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/11f0e89e3a5e606227e00f9526e4f5cb/sobot.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/90599809330.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/18537558512.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caa62de6ef---25487354405.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/29228545109.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/59321758926.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gogox.pdfIn PDF document text
    • http://odumakus.com/uploads/files/24435058817.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/17001811636.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/durumovexewexopu.pdfIn PDF document text
    • http://metallpress.ru/files/54309631912.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/suzawoz.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/paxemerilemejexepedosolal.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2eccac89e---saduzumedirisaweruvat.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ik67t5ke52a0dihtosp3haj3a1/tufivetonebez.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/2693313498.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f7df674866---rupozurip.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/rafefazisumolalibisofimuz.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/dosawigexiwoxexipawema.pdfIn PDF document text
    • http://aa-nusd.jp/tolaw.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/48856342543.pdfIn PDF document text
    • http://chinalabware.net/d/files/xonisoki.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/54193021195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ies+master+previous+year+question+paper+book+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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 19136 bytes
SHA-256: 318bdb40176cd4686cbe9f9077d2266abfb5ddff06504f96f198f3241fe22e30
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 11220 bytes
SHA-256: 4a161c702b28b84f18966afb3615823991dc40bf00c048d3861dc7bbed981119
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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