Malicious PDF — malware analysis report

Static analysis result for SHA-256 db234ef5f6c7b25f…

MALICIOUS

PDF

91.0 KB Created: 2021-08-11 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c69dfc707788b63a6a8ca3c1ce0f87d7 SHA-1: fadd3241caf06791e1e2d02c7dd685f63e2ca7dc SHA-256: db234ef5f6c7b25fd8b995b59cbe65e6db09aa9f7660268e2e7d8a6377379c6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://bloomeng.com/uploads/24740529620.pdf In PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/pojolezabuvufekigadalesuw.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/72639234108.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/19385345899.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9c72244ee06fca464e45d411d86feb58/jekovorefokukoji.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xilesotipenamufowekil.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/timugavikipi.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sovewuvedamakalufuxe.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/bexuxobexaduxirubukawuz.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/15428417304.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/49999087360.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/dojipopololosesego.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb84823a7---35822117265.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/88529772551.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/34092034345.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bdh87foi075gp5aqsg6704l377/zixepufibagaduvesilopo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/950a4c6401df2fd316bf6633655f2202/55423166317.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7a4948cd14b8a2facaddab3e7f5cc2c5/61286419659.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lunopisafukutad.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a37434e83---86859249118.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/12117425111.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/nolupu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5afdc6d49---51278889758.pdfIn PDF document text
    • https://wonkingchina.com/d/files/92498907385.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fbe36385fa18921d737e62ea2ccb596d/11777726407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mardaani+full+movie+rani+mukherjee+part+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 11028 bytes
SHA-256: 14cf02989f11fcbb6851c03a8c55797611901abd31aee105c5c9ebf0bb160394
font_01_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 18108 bytes
SHA-256: c48f1b46efb1336685a7c9f54b549c63270818433728b1787ed1aaada7c89a93
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1