Malicious PDF — malware analysis report

Static analysis result for SHA-256 364e66d7634e4ba4…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 15:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d2da65bc2f3bf94a3efd4407c445669 SHA-1: 5d73311c448d32967b5ed0eade52d39d723a34a6 SHA-256: 364e66d7634e4ba4f3789618c34e2fe6f8f7713db893cbfaedbcc37801ae2175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, possibly involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://clairerolo.com/userfiles/file/26088957875.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084abb014b55---38106055657.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/nukivajurinuxogebivede.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/sulejowesu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608031d0e312e---pazukajok.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8d8d07187828d03ec10b87c52e2fface/25064480663.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/sufixuribobopix.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/86734302212.pdfIn PDF document text
    • http://bronia.org/userfiles/file/navuronuzimapimeborolez.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/xupodigolitabofo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ed9eb047---19476366946.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210613083327_gzujja.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228733bb1---8036055440.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/begabirijerorafusogaw.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/kunolimutajonavutejeweg.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ec0b4f6c---45592592345.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/963v1bap7gqa6n13bbsr7gj1v1/93554336178.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c69dcb43---78642356191.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/71f1caf33dedb0250aec39a3f4631110/29907009013.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u3laikg4d6moe8bojc7ghlppm7/lujuta.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a538a04ee4fe972c4a8c5b7a68d3fab2/17143009807.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dcc67ea9---20815770600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reset+logitech+k400+plus+keyboardPDF 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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 18688 bytes
SHA-256: 672f9d6ed80b7db4dc1d715cf38146d411d2b79b938887bf4d67b8a3fb16e5dc
font_01_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 11412 bytes
SHA-256: b461aa346f99feb1f8b8716c666d71645a40f3399b51bef8589c5ac9130501e6
font_02_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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