Malicious PDF — malware analysis report

Static analysis result for SHA-256 8753088e1925c1b0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 02:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0072dfeb69580a75e3fe03927cbcb5b7 SHA-1: 02d78f06a7f676a020b8adbf3c8853a861b3c3b7 SHA-256: 8753088e1925c1b0913232f0efa62fe8dc8a4e9cb88d6c5df093367b5fc1170f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dinskayarealty.ru/media/file/bigejizidumajatonobunufu.pdf In PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nudevapogilediwiti.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f06cd8e5---noruxilutigiriterutaxe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427b2c0f61c---15270019113.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c86f6f61d---43432423548.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c85ebc833d4f877e2ecfae329ad5801c/53111225819.pdfIn PDF document text
    • http://ty-int.com/files/files/guwexos.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/21139747504.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/suzimedabagasajovofo.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/38606192722.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/66922517058.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fm72vrukfor03t7i7o840cbrr6/fuzunuguxef.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f55c2792e20c8fef15ce88a448f072f7/fiwujifixopifeg.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c148349e696105f5ca3882c1111b1/72577038388.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/27242986783.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2d2c5ca6---xijadowelexakolavufato.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/mesugilileder.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/suxaluzilo.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/39885278784.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/lolimabutir.pdfIn PDF document text
    • http://sksound.com/userfiles/file/nosulafatozow.pdfIn PDF document text
    • http://trevorhannant.com/nedigokesegi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131456f9904d---loguvor.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/numonosepevudopad.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/fijebapuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=auto+clicker+true+developers+studioPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10480 bytes
SHA-256: f564cc5cc219a53f06bd265259fb14b9104759ea057241eafa0623f0bc59bc7e
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 19204 bytes
SHA-256: 0bab0e1080250bef4084bc4bb93ea15f1b392367dd4f9b2993a6b00488792381

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