Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3868199f5e818d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a81774b6cab052d48eacaa967f46f07b SHA-1: 90153335e5d7274c7fa5d80518a8c6ee346c234d SHA-256: fd3868199f5e818d46fa609e6f9c701afeefef695347d8c13d89b1685cd7dfb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://damnoen.com/ckfinder/pho/files/96212813642.pdf In PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/67258333814.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/3850682838.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifosimosatixe.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/50850624079.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/89437583794.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/96420276640.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1155f0cfd---xodixosukarenapejidep.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/5973331571.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1aceb038d2aed0b5c7880be619b554fe/zawito.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/54383447064.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/fizanojofezupuzujuwirur.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/85248776336.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/tadurox.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sotiraxujolokavetenenamob.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/15741812400.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/vikidorafefimokujofaxojum.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/77961889284.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031502079736.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/81817275878.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/37ad92a28ee6cd2185505b77e488c7ec/buxajadatinuxan.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63624563965.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/78882469941.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcae50389---79789938946.pdfIn PDF document text
    • http://ifap.it/images/file/2145689562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=boss+karan+singh+grover+full+moviePDF 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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 10876 bytes
SHA-256: 56e1effb512d2007239403b401beeff7ba79bdec1456e606bc1fa497ba2fd441
font_01_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 18512 bytes
SHA-256: f0820bac2675af1790457b30830ca4162e27ccf80e97259218afe7b8746a7f25
font_02_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1