Malicious PDF — malware analysis report

Static analysis result for SHA-256 66826c05a907a2b9…

MALICIOUS

PDF

82.7 KB Created: 2021-07-22 12:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98fb9e4a6319ebd3f4371afc2d0de162 SHA-1: b4248f35d7f1e79cd38dd1779074300e5dbb8d84 SHA-256: 66826c05a907a2b9ef6e220b92b351001916db546ac47062a135f51384b8d460
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on compromised CMS upload storage and disposable hosting. The primary goal appears to be SEO manipulation or distributing further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aqbnb.com/uploadfile/file/gatotogotilim.pdf In PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/zajutekogu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/40521141503.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/65805072836.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/fofenifirekev.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/388c432d3932c0f494c61f12f5f1eaf2/mizajineli.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/nemixu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/17681011273.pdfIn PDF document text
    • http://18554080.com/userfiles/file/9136351186.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/didutiwuwomimo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf486d06555---pelajumileratabe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4923ce18---51479825173.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/88718383666.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/suduvalukuwegoladi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0a673892c4577eee9d0f4f6aa11db81a/daropotamizurakazejata.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7822b1083d---69196833271.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7qhfg9ekcenf793sckd7b5l96j/26148064181.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/76ea54429367720e762cc37c3818948b/faguzowovozodivugad.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0df5278c26d392aefef784c98e56d77c/lojetisurikalupekomajami.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d95f67b21---tilaxobijasovavadewunit.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-22/20210522015248145297.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/susunulixebalafirelem.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/renel.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/nokuxemomilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=outskirts+meaning+in+bengaliPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 18312 bytes
SHA-256: c2c077d9224e5e30b36445443b76ec8cdaaa4bc87f4433533a73912faf72400b
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 10688 bytes
SHA-256: c8410dcac8db29a7a41ca64e18ecdbb741a9eb1bbb3b49c3ba08e58e2b7a63d6

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