Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84660fe31d51e82…

MALICIOUS

PDF

68.9 KB Created: 2021-09-22 16:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5ae19b6d4e784f0b6b6a9a381de3248 SHA-1: 99dc457d7fdae739a7afa9e9ea885bbf552e20d6 SHA-256: b84660fe31d51e82b6a87eb2a452a65c4ee1e1c1e0f4558344ab39997ec7bc93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dunakeszi.varosom.hu/userfiles/files/bipilikol.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421aaa3dd08---ladajejit.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/87478773904.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/9802389354.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-19/20210919182909350019.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab9583f59---safurekuporudigopupedekax.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909091333.pdfIn PDF document text
    • http://motty-etai-sharon.com/files/files/zosilut.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/99847838969.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/vufununodojusowu.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tubapaxurepulibuw.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/judisakopadanazitud.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210917011743.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/46919963009.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/kaxavobo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8a732fd258393816e3ff5568835e060/xevisin.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/41222638877.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/4472924804.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109220246052566.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/naxurukoba.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/56120903069.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/beref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=one+sports+apkPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 15108 bytes
SHA-256: 20096b96648209348650da8210b1b027ee13271c4e7a4c023c10bca414e107dc
font_01_sfnt_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10224 bytes
SHA-256: af38d2bc4d905a9d95e59da7143a0bf73233dc14f40197efbfeea7e7a5350876

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