Malicious PDF — malware analysis report

Static analysis result for SHA-256 84743fc370cc2896…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 17:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c326e9071a5754a58071df7aaef2858f SHA-1: e3c4aeea004aad210975df5f6c42cf6c2be4a15d SHA-256: 84743fc370cc28961e329544b961f9f1686adc59cd58a5918c770a25e8f7cf09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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=mi+10t+lite+vs+redmi+note+9t
    • http://ogledalata.bg/uploads/pages/files/73803079472.pdf
    • http://bannails.com/fckeditor_userfiles/file/firelizi.pdf
    • https://triatlonshop.cz/userfiles/file/jomumiwobunolafebalur.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/nafofi.pdf
    • http://huucodatlanh.com/userfiles/file/tuzikudogofixesokor.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/86747782779.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xusipebono.pdf
    • http://kingswaytyres.com/project/kingsway/uploads/file/98482759310.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/doxom.pdf
    • https://ego-sofa.tw/uploads/files/202109191248061505.pdf
    • http://metabolizmusonline.hu/images/upload/file/zitagide.pdf
    • http://logicparcel.net/uploadsEditorfile/likefoxefaluvorezezexej.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wifurijetumij.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d8e6d514---nigozefagexusotirogad.pdf
    • https://saikekanglun.com/filespath/files/20210920062258.pdf
    • https://rowsontw.com/shopadmin/upload/files/7793041543.pdf
    • https://vadihosting.com/calisma2/files/uploads/bipatibopazum.pdf
    • http://gelateriacool.it/userfiles/files/bubilakufobalig.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1fe2fdd224d52bbac94cf6df9d80787c/sizajufopimepek.pdf
    • http://udokutscher.de/gfx/userfiles/files/81280321641.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9e3e944e6253140fafd3cb883df3cd1b/luwelukopuvunu.pdf
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/19290161960.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_off0000e17c.bin
08fd21a05f2ba8c201aff3f470fd0775e0de0a090f4d754a7e8eee0bbcf6fc21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 21260 bytes
font_01_sfnt_off000117ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16792 bytes
font_02_sfnt_off00012fe1.bin
88961d26f4914c78ab50930621d1803f1931f1ed7d41b455dbace4ab8020e692
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 10648 bytes