Malicious PDF — malware analysis report

Static analysis result for SHA-256 570eef3fa28e2437…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 03:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50dc9bb1e8cd33258a891c681a4f1df1 SHA-1: 1f7ec768a0364ff0ef8bab458513732268a577ef SHA-256: 570eef3fa28e24377147efd6e5f233e1644dda6f97b7b869f57d3dd2a3c57120
164 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pjcwyy.com/upload/file/77808017816.pdf In PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/nebosajelukeriwinufam.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210608_6079D3CF53E54C2B.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/penebabulipopi.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/64280519181.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xigebojokusapuniwojixaxu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/masanupipokaxitu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/petulimowerivixum.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/39701898620.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e991b284d7---rajegedegazaxuji.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sovagudunexerekunaf.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/xagiduru.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/fovawezesetu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d67d268625c656e34baa8423fb69073f/tosopur.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ktbhee2u48ttbd8qjfioa3b7l2/93165811034.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a368724aabf628e34292d456f8821784/74215964936.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/48312753291.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/u317f97h6v9s49n54a9vfasaum/6281211854.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da372cce7e---mugipegerozilo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/nufejodosomujisipu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cnch2vf12sccnh9molv0c8ns0g/kuxisevek.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/zovetusijufaladasik.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/58770272921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=past+simple+tense+test+multiple+choice+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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10888 bytes
SHA-256: 116cef37618828ae5fca720167e42f8b4fcb234518cce03587e135cee0adee79
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16276 bytes
SHA-256: 72d1cbcdae294606c4b797c194f783e84fa8021b87e87da7f9c611a6e3ca03a9

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