Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ce9dad09a253b1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 07:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ba980c700551b036a9ff7062d50246e SHA-1: 750f0fcf2e01c76972b0a0780e31e41bdb4a2239 SHA-256: 27ce9dad09a253b1133941c36ec3aa13f08678e8371966658936e881f08fd8d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate this JavaScript is used to redirect to external URLs, with one heuristic specifically identifying a link farm pointing to compromised WordPress upload storage. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

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 http://lnimeina.it/userfiles/files/36434886972.pdf In PDF document text
    • http://mrcookie.tw/upload/editor/file/081211441415.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/1165862156.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18811091741.pdfIn PDF document text
    • http://besteva.com/upload/files/bitolejesujogirezotaturej.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/61567905179.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qsg222r95o72ssp6jfppfpjfud/linasifitixexudazib.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/tuziwepuloput.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090905010270554.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wixowinejiwujebukiko.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322762e682e---4835515877.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903175847.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161309adb4f5a3---72968336138.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/84790306473.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/65184336133.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m8k4mra6gao1c261csfpiujamk/dakesujivikugunelewuta.pdfIn PDF document text
    • http://sushi-belovo.ru/files/gevubutek.pdfIn PDF document text
    • http://mextro.de/upload/files/25851332076.pdfIn PDF document text
    • http://travellerisland.com/files/32308042442.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/76379307819.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/82177277798.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/daxixilejiv.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vusuzuzazexuzid.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/12375181821.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/nipadukamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=new+york+times+premium+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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 10632 bytes
SHA-256: 095a28791c9514f3140c3777eea0ae76a6c70ec2b9821c4782168a5c54948590
font_02_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 15480 bytes
SHA-256: 434031e8998abf46163fff3aba2a0e46ae1afb4c9203c8449fc36640b1571761

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