Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eba64e3783cc83…

MALICIOUS

PDF

68.2 KB Created: 2021-09-04 04:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03ec48ea7ab87c7a3dc70a3c7e411db6 SHA-1: 20054e859c6e2812bbe3bf5e6837dfef4ae2c5bb SHA-256: 52eba64e3783cc83e31c930d528ea8f2fba754d486996666280d5902d4f43c26
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8341

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://china-zzld.com/uploadfile/file///2021072009210496.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/nonuzinigonu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b31951fa04cb7820bf087911ac992bd6/wutulakopedurugiwanolevik.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/xixazefanofi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xoxabuwakotijegiwabobu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cpkvmrdlsbtrv7ei9q6valltgn/zotisuwofo.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/17722366034.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f496271d---67345321939.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kurilemafakudebifidip.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3096028e18432878727d14b8f13f62ba/54908905966.pdfIn PDF document text
    • http://thongthien.vn/upload/files/dujozivimiwevodoge.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4a75439f0ecf9b3576b274112191b21c/siripexinadubijulofim.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vujerenigiz.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/pupowakizoxinadewofakumud.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/9383923713.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/nibinokazitixowekaxeb.pdfIn PDF document text
    • http://abwessex.com/uploads/files/50867320685.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/88089289033.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9c97860103b540999242e7e496c661cb/16115186510.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/88738541660ff52651f5b3.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a892dd1e---bitanaxuzatepagil.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tivanafelevazediw.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/xabubejenofowogatesupoten.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/69448991907.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def19209c58---dazuzamebura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=insert+blank+page+nuance+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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