Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dcbbc9ee2d8579…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 14:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: debd4c24bd077de2dcde2d2c62d5246b SHA-1: e9e52233213de3a1dd1a82f2088f524066f6f9d5 SHA-256: 20dcbbc9ee2d8579916d96d8fcd61d5fc3d3a6aba47b62a4bb90cf7bc93ce8b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://toyotacri.com/userfiles/files/62389557778.pdf In PDF document text
    • https://intersat.lv/files/file/wawipofijujemetakesitaj.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wosukuvaxizener.pdfIn PDF document text
    • http://watch62.ru/files/files/ditepabidirolavoliladila.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c0433fc2c17455b422a45201c2a5c10f/bogedajepomufukigugi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gerapokotetubopolum.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/jalafafep.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gukotabujupakuxuzoj.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/76650636548.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c4a2c162---84632635276.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/14254772053.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/davibewofonaxiz.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/lesabofekufosoforilatupu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9c979aea---35832835062.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/79705233335.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/64745863581.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/tifejegetulodo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e9f82a596b337f46eac24a062aff965d/38550137550.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/zijakatosemazubado.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/walesajatomanovojito.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab3d35acd---64930224812.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/61155608276.pdfIn PDF document text
    • http://mayjack.com/upload/files/72644630980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=edit+polaroid+di+picsartPDF 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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 19604 bytes
SHA-256: 7c397a2572c5798d2aca3c1cc397578e02a9143daf9ea64fe6291a4709055315
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 10252 bytes
SHA-256: 511e78eca5d5f9bbbab5f6141229c88411b4a06aac98500980095c296e53e12b
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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