Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52371b8d861f202…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 11:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ed7d6296db45d145e335988ca05dd6f SHA-1: 7e1a1f17727a95d1919c6307ca38e5be1b2b7922 SHA-256: b52371b8d861f20207a54914ac7255c5944b2d04f0a47bfcb64bc5a7511a2885
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to download further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick users into believing they need a password to access an archive, a common tactic for bypassing gateway security and delivering malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=what+is+my+phone+ram PDF link annotation
    • https://didacostruzioni.it/userfiles/file/posuruzegokaporevep.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/21051046180.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9d8e04212ddfd60f9085e1f67b5a7844/42610172577.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/palevowixatomudubima.pdfIn PDF document text
    • http://someteme.com/archivos/_20210915075009.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kevisamep.pdfIn PDF document text
    • http://vit-physio.de/file/relokaloligita.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/gitigiz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/38fea329bd3d5272d36478872ae8977f/66063395928.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/bukesulovirarizepi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/10109734799.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210923_4695E5334F232CE1.pdfIn PDF document text
    • https://novsport.com/content/File/7952214992.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/66695437968.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/noguwup.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/jixabupabukororoloxokixa.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/49205460910.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/nutoteronejemukomosafevi.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/mepew.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_EC0D921001405151.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/30071428553.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r51hp5p334vi2fmkp11panqtao/78244211069.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/29305660131.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3c5b3f3edaf28179c7c3dc586de1c61/gozunix.pdfIn 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://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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 10576 bytes
SHA-256: cae3e6376c8250c41991ef53b868fb93cb392930de6a252e2657a7cdbad2157c
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 15892 bytes
SHA-256: 8f94d07db052ba908cb06c22f2256bf387dad9cdebdec19d7067ed60e32c5280
font_02_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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