Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a7f7c6bc11f9b5…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 21:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be8008f2d279d5df819698453300377a SHA-1: b209b920cbd1b43a0ef298c57433b3d3617a9929 SHA-256: d1a7f7c6bc11f9b5cf20ef03de97997f3fd6b0d9f565d4bfb7c8b4bc63d0b802
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://matraholding.hu/images/userfiles/files/gejab.pdf In PDF document text
    • http://huiking.cn/uploads/file/270112283463.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tijalofifaxajefilubiveb.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///10756107725.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/tunuvekowowivudomobo.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/pukazizafijikido.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090517234240.pdfIn PDF document text
    • http://prosquash.by/data/61975957554.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ea9ce02b6962afbc5549256821377b13/desubijeverefike.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/nalinabe.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dapoxo.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/xodijawiketunevizup.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486b8708934---33576769098.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/dedefifinedudiduvu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161365c6b41bc2---51130862049.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/rinagaxudigigi.pdfIn PDF document text
    • http://shopabrang.com/images/files/31301851518.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vilozazofitegoni.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xagavuvurajewavag.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904072225.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/memuj.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/38007963263.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/75199329836.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jowoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dr+rohatgi+oncologistPDF 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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 10380 bytes
SHA-256: ed2e601e27fb4a880dc5fa2fa2da865eebc6e27fdd7d1e361db3e6070f1e4183
font_01_sfnt_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 17748 bytes
SHA-256: db4c7620a835c848c552d3dcd540a4009bb254d28fd6243aef41ee0f45191e8b
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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