Malicious PDF — malware analysis report

Static analysis result for SHA-256 2523f69f3394b803…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 11:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76056c895061edfac6f0872021333a3b SHA-1: 70969e1a9ec3482535c84b1070e4d0b08fb6c706 SHA-256: 2523f69f3394b8039953eda6660403c394761e799318f3f13d72b0c6da11ec5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=jacksmith+hacked+unblocked PDF link annotation
    • https://knoxvilleremembers.com/media/27851761509.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c61695c308431c92bb1686d3e8c9a8a/bupagekosami.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/29510389143.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/vopuwazigebadepalisabip.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/suvosodelatigu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff055eb20a---68080874336.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/daxefonatinetakugu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/minarurofelotadurile.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/66049501251.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/39829723367.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/83243197128.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909140417.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/89340331377.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/nizovurusa.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wisikamiterosagob.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/70428f32757e416b250a4c7b86b6ffbf/katedibizatetolas.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/nabewip.pdfIn PDF document text
    • https://tckontrola.hr/files/podagulowabajo.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6379224876.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gakuzakedexokirawegokudul.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mefurowate.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/wejajipazoki.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109020148038214.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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 10860 bytes
SHA-256: 07bcbfeddf0e5eca7a6bc65dc374947de1fa10fe9b9be04bc097effcf390e5f6
font_02_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 17040 bytes
SHA-256: d48914246d14d9f59189c0823e428f083de68f3692b1bc86a67e9dcc89a7e1b5

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