Malicious PDF — malware analysis report

Static analysis result for SHA-256 717335a8c4615c5d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 06:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62cf70f9a7cbd7bfdda8e784fba50882 SHA-1: 040bfd0029c4a659468f277245053dfc14f610bf SHA-256: 717335a8c4615c5d7198b271aae70294e939da290499789b1db373a9eed10009
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The primary goal appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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 https://chingchia.com/uploads/files/202109052254209001.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614212de43605---27170058730.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/berosedobo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146affbd511e---50154184546.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109041008181725.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kagisa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b6bd811ce85cd163f86a14bd40cac17e/97572385465.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/fizaz.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/947756853.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/bupiburapa.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/voposuniwupotuba.pdfIn PDF document text
    • http://mamadona.ru/ckfinder/userfiles/files/jofij.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rurusobo.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • http://zxsolar.com/d/files/tuzowekigirorofafigana.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/44863146933.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/luvuwowadadi.pdfIn PDF document text
    • https://ienter.bg/files/89782501029.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908123831.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///68944869362.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/22234107684.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cca56d909465c5ab5b385b5376c953c7/rusuxowemizumekifaguv.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zivek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+can+you+do+with+crying+obsidian+in+minecraftPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 17348 bytes
SHA-256: ccd13cec7591ddb6f1a9430d575c5c36621d67194c89beeb5809d2abd361bcbc
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 11308 bytes
SHA-256: 7f013cd1a76f640eec880f1ce57beeac9cfa1608ebd423bfa3dacab453346d42

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