Malicious PDF — malware analysis report

Static analysis result for SHA-256 c459e3a63d60c90a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 00:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba599d294432cc9a57f43819a7d4d452 SHA-1: 6efdce34840a6dbb492d17cf15c92ab6c8915083 SHA-256: c459e3a63d60c90afd458a3fa2537a4ac998156522c4092009e664fc6cc09080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of a URL with 'keylogger+para+android' suggests a phishing or information-stealing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://huntic.ru/uplcv?utm_term=keylogger+para+android
    • http://1utilaje.ro/mm/file/gedelerokakudopufer.pdf
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/navuselozaramasirulovoniv.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21452976768.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/pilokaxu.pdf
    • https://tidaksusah.com/contents/files/38392611677.pdf
    • http://visit-pune.com/userfiles/file/julikuduxuwupejodabevef.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vagumugididama.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/27496ea6921c60b49bca8622d245315e/bojovuzekijalawokog.pdf
    • http://marisqueandopremios.com/campannas/file/46708532089.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kejimemavipegufefezik.pdf
    • https://styliststudios.com/imagesTE/file/27759774432.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeue9goml4dk41kalh4sjmc662/71147448525.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/vipupafusuvob.pdf
    • http://steakpluspizza.us/userfiles/file/13219537466.pdf
    • https://giaphutelecom.com/tctt/sites/aaa/file/98923569125.pdf
    • https://taipeitccia.org/CKEdit/upload/files/31611287718.pdf
    • http://fujiya-burbank.com/uploads/files/40581458631.pdf
    • http://snbedu.com/uploadfile/file///2021090520323645.pdf
    • http://cosmikkino.ru/sadm_files/39602424444.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906011221.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h7n8mv03gfh4q36fub4bu5paim/lixinuwevipapikatilamak.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16139dda8c4622---jasaxesagot.pdf
    • http://levne-pohary.cz/UserFiles/File/17823041437.pdf
    • https://lostfoundglobal.com/userfiles/file/lebexutizeledilufutimomit.pdf
    • https://ambalatender.com/upload/files/loraxiwogivawazosisawu.pdf
    • https://tsydesign.com/userfiles/jws/files/nudesovuxube.pdf
    • 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_off0000e75b.bin
b84598bcf3c3d4373d2eb6f37d945120e8b34cb2eaddfa0e480262885ad5257f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 17720 bytes
font_01_sfnt_off0001141a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16792 bytes
font_02_sfnt_off00012c31.bin
06dd4789423653d5b59420f70831fe1bb05ffbca51850b7783aab58f55dad552
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 10408 bytes