Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a82dbf25019333a…

MALICIOUS

PDF

88.5 KB Created: 2021-08-15 22:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9760b1f97907b457637a332acc9c3cbd SHA-1: 68b0af80fb593b988103f8557052d86f7c090744 SHA-256: 2a82dbf25019333a485d409c477a57f8d390c299718279bdde6a25a458416bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further payloads or phish for credentials. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094515b06d0e---zeguluduxowoxadisovopi.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b1df35e06---18050567078.pdfIn PDF document text
    • http://ubest.ru/images/file/tibes.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tugexabux.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f069a64419523a8dfe16974c47e445e1/15234388727.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/81411547759.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fabdb35d99fb5b4fbb016874eb2822d4/tosujabebufivi.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/88055521821.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/74891383943.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/26a1bd1422594d11dfda59fa0b5554ab/sowavejokirepag.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69c52ce40---kibejogofekeka.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xagapavafeligibomateb.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kubujojevuzexa.pdfIn PDF document text
    • http://orlickachata.cz/files/files/45592907730.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/gegurowokibekodekapaloja.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rapawurazuvoxexojitotaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89e7478277---34120564750.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/33431145546.pdfIn PDF document text
    • http://getem.plfiles/file/lidawod.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/segamox.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/gipurofiradidukonulorol.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dbb5faad---31008766950.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2440e14298d37df4ab172c05c3f0178d/matonigalorekiletixasesax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=windows+10+descargar+iso+espa%C3%B1ol+%2B+crack+megaPDF 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
    • https://mega.nz/file/hcsUjAAa#rLy-T_cXQX2p_xV2ZmU7eeRV0WslWqg89477c8U1AtoPassworIn 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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 19436 bytes
SHA-256: d8ee228e20d47a5f2b5f56421fe3be01a7b8b9831bf1ebbd5e8bf734bcf6e032
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 11308 bytes
SHA-256: 09bbd775602822806ee7173aca43850017d00390ba21bd61dddbb3b606c99538