Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761ae9aed6e3344…

MALICIOUS

PDF

105.1 KB Created: 2021-07-10 09:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f07a046619944303316ea702b0cdd2c SHA-1: ff3d8c6292095c626d3792c35e859642b097afbb SHA-256: 1761ae9aed6e33444c7a89ec56625f5361ae7e9d215361221b0a2cac7d3f510e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that point to various websites, including those hosted on compromised CMS uploads. The primary attack pattern involves directing users to potentially malicious content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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.
  • 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://growlink.biz/userfiles/file/setixipumifamujikagovete.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cffcbe9c39---tozigerebupuzigu.pdf
    • http://ilkyoukais.com/Images/Media/files/sajixiserifuxewezerud.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530869f525---36629077799.pdf
    • https://hyosungulf.com/uploads/file/58802909309.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608144038b06c---58840117238.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3756b604---xusapageminowusije.pdf
    • http://skyfestival.kr/ckfinder/userfiles/files/94008371430.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608696bde264d---97854178440.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3677dfc---zujolewapix.pdf
    • https://ngonluathan.vn/images/ckeditor/files/56087846653.pdf
    • http://kimandyoo.com/userfiles/file/folajunowawuborugadoroxaf.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d422aa7fc26e74b7eb6e5d43b177727f/pigasovukijapiwanibududo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f98d9f73e---budozox.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4534142a61---99267146590.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28a176967---nukid.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc00a9f846---bepukur.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nupejitele.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/motefirenixiruzitun.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ookfpele8mib1n6els0r6nnv41/nadokimodixede.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26f2e0ba8---bawiluriwolajex.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4aedc8fa---givadenofanul.pdf
    • http://montazerangroup.com/uploader/file/xovuzidobigidupijad.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uq6e7nscb4dln9g8f2ea8te9sc/molen.pdf
    • https://cabsfromheathrow.com/userfiles/file/7967276898.pdf
    • http://charivne.info/images/file/zutadujov.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca94dc467---razozikiwovidorifaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+a+square+be+considered+a+rectangle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134e4.bin
2343afac07cb3968f5808b9f65e6ed7df0e7301afe2fd8f39cde42427209664e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 17976 bytes
font_01_sfnt_off000163e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163E9 16792 bytes
font_02_sfnt_off00017c00.bin
1f83eea1923954eee589a25d83418c784923369224ff508130d7b8764c52df19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C00 10964 bytes

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