Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdea3a8b984c085d…

MALICIOUS

PDF

79.6 KB Created: 2021-10-10 04:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54262459cedab77e77ca74428d041017 SHA-1: 4f831611632bd129bbb1b06027affa4ec9215f8d SHA-256: fdea3a8b984c085d4bc506d3476458623ccd8c289891da97f60fa001ea14fbe3
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to external sites. These links are likely used to direct users to phishing pages or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://huntic.ru/uplcv?utm_term=if+sea+levels+rise+1+meter PDF link annotation
    • http://www.bsa.by/ckfinder/userfiles/files/fixekazojejisime.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109031911313566.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/62014675047.pdfIn PDF document text
    • http://pelicanfinancialnetwork.com/ckfinder/userfiles/files/walozebobefetenebubezom.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/kugazazetotewej.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/11918528030.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xerilupopisofosozu.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/rijoneko.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614511560b819---53504738625.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kizuropifuk.pdfIn PDF document text
    • https://bor-diing.com/upload/files/66398189897.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/jonegidagezududinelixel.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/5574092092.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/35842521731.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/43dea8c4edb4bdaeaaf59ec09108bb2c/65513893152.pdfIn PDF document text
    • https://seikai.jp/free_images/files/88989489130.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/nomudewurakamixawiwod.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/81179506219.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/penawonixijupatirezo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3094a9c2---dubumu.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/zusuzerufilidujam.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/828090942.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/mizuzubopemimejuvixe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdfIn PDF document text
    • 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 18728 bytes
SHA-256: 1357b949924df72af877f7610fb955568a0dcdd3929df051f08b2a50dc8aa284
font_01_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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