Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eccaa4eb23a6aca…

MALICIOUS

PDF

96.6 KB Created: 2021-09-21 02:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d840ac048394b63a62c759dd82c63e8 SHA-1: 5279b83025ec9d35463f3c2dcb9cb66471ba2db5 SHA-256: 5eccaa4eb23a6aca900c2d6b4920a846e801d828f33c10df199bacdd2da79696
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or redirection mechanism. The presence of these links points towards an attempt to direct users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kmsenior.org/file/files/sutova.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/bijudolep.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-10-56-15-79.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jomav.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919151528692753.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/wofaxo.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/pusetomofediludof.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368bbe1f8e4---kakiruwoxolapurasoxove.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/181c766a5a585b5aa24d5946e4d20052/98551735933.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/digup.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/50090257395.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd9fda05a3f5545c66a99d88a51efed/bijotutajasupep.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/milatavexenejujiminosew.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f342a443c7---tubiwetovitev.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/6326836367.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/848805215.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210914021839079.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/52330679233.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613eccfa1c52e---rexegajixawuj.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/55603344001.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bakatom.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/83039680903.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/27178569991.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/87487616828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=playing+with+fire+free+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_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10760 bytes
SHA-256: 0be3b5c949f11a21f900b6d948db134ea8051dd6aa9ec0f57d84a1d74ea867c8
font_01_sfnt_off00012fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 17336 bytes
SHA-256: 4a9c631a50fa0e97ff9b582887b446c2b90edb63b96eb96483324769e2eb3f6e
font_02_sfnt_off00015cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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