Malicious PDF — malware analysis report

Static analysis result for SHA-256 43df72dcbbdec91a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 886575b2d6445f4efd9b31906b5b7576 SHA-1: 97b2c53b903a86fac48be9878be4a1bab17a40e9 SHA-256: 43df72dcbbdec91acab4af53fb6c9aa5e02e2a7f6f5a02789a97980aacc78b3e
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 hosted on compromised WordPress sites or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://aykutemlak.com/upload/ckfinder/files/tigifivejodat.pdf In PDF document text
    • https://grupa-energia.pl/attachments/file/27521392628.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3ea1b34edec5e0b503a568c557e063b1/60883492122.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/18591696553.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vafubusimavi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/goxowijoduvu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/89867663543.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tozopisireberikije.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/21490942754.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/bonenimumafa.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pobudabinesigatutined.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/365ijck9ht99rf1dm55fc51uik/42591259585.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b637cf1a52---16290260233.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/fafoveduzowelikula.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xubez.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/wudibetenewebokig.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/topad.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/14802025894.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/25752848130.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/povedizigibateliz.pdfIn PDF document text
    • http://entrackintl.com/uploads/bapetewi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/notuzuwiretusosogawid.pdfIn PDF document text
    • https://nistd.in/userfiles/file/35242542789.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/pezadiloronaxotilugotido.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/zisoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=offline+encyclopedia+appPDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 17996 bytes
SHA-256: c9bbd7049ea6e4da89ee39e40dfc398121cd70b078e92b870e81e8806501cf47
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10388 bytes
SHA-256: ac49f971dafccc8517f02f0b8d19abee23bec7321214a9851844aa4c4ac82daa
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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