Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b72cc272d94a1f5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 12:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49145dc76e97736be10a1b19278fb376 SHA-1: 116f6ce83e39c0699167e2d54c56d49d367bf05d SHA-256: 5b72cc272d94a1f5178fc0035c5ebaef97c2bda65d75b2faed714ef00c604fd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=how+to+view+archived+chats+on+whatsapp+android PDF link annotation
    • https://www.fangjin.org/ckfinder/userfiles/files/radavodafelag.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090720445328.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/pojego.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/wemepigaseberadukedazo.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/51712108771.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210910/file/23122774829.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/91668088394.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/fudedogibe.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/39104367507.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/79atpl7cndpkasaqa9648amd37/gukowilopujerurop.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/83370687705.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/vawogotuganalesubadonise.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/42960824530.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/mulilofupomaz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/klmmi0q2mttg7thp4ntoppqdup/libipowev.pdfIn PDF document text
    • https://rippa.pt/files/file/kitazinutu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3db6e3c0---lenijunobojoseda.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/memupodavanis.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xebomirelufamobu.pdfIn PDF document text
    • http://zxsolar.com/d/files/rudis.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19504612559.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132667a6a827---43900880662.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/28552501430.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/bufepixux.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec673cd8e---20070866483.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10708 bytes
SHA-256: 68301233459695d6c9000622360260c4d33d2f4468d2fddbe20f3906f2fd00b1
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 17976 bytes
SHA-256: 4eee0920d8ac20a0ec72a40ce2022c0b649403673e7f3b0d41fcd102080036b9
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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