Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b048b8269c2d2c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 15:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3408faef15bbf6e3fcf7ad74770b337e SHA-1: 3f335a75ecb2c3bb2f6a50a9c74be5ebd9e433c9 SHA-256: 59b048b8269c2d2cdda850a27165b566e2a90ad9c9411d80c5cb1122cb949d72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=right+the+night PDF link annotation
    • https://aymexco.eu/ckfinder/userfiles/files/gererojowigimodo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/6589767998.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae36f3ce8---21890507894.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/69261556620.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9b776ae8---3195694885.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/vuguwalasul.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baadffbbcea---81878654299.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/mijesor.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077447e1e7aa---muwegi.pdfIn PDF document text
    • http://charivne.info/images/file/27398497810.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/549151050b7f1831603d3e55a0d05422/62422958182.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/bevinuperonubimafef.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108100347582641.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/660aeea0bcea28986eb52fca617c5cef/36915542471.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c43a647df023d4810c2b568ce83add80/dewowoditonurapusad.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/durof.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/99994573331.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108242035113795.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/5403a43269638d1dd84d0642c85171c5/54439625137.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3b952f69---23644332750.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/34c2009149d83173b16a97e9c7efe6be/61174009098.pdfIn PDF document text
    • https://raljob.com/userfiles/file/22070449428.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210828092515491.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/59226030026.pdfIn PDF document text
    • 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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 16540 bytes
SHA-256: 84506d6003b2e5c9dd17718e53ddb890736cb569d2796e145af0c320d175d3cf
font_01_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 9836 bytes
SHA-256: 1a857321f53b18a1420fbe0d633925ee00043ff304f4d64a8cb139fcc1ec6ee0

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