Malicious PDF — malware analysis report

Static analysis result for SHA-256 e296e3cbeabb091b…

MALICIOUS

PDF

117.3 KB Created: 2021-09-13 12:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69ba27d2c7daa05af46aa4a2647ff8e9 SHA-1: 13d0e2905c1ea11be322d768ea2c87ceaa4fb09a SHA-256: e296e3cbeabb091b5caa232ee9d1e7a23d70f081b4407a96e3ccfe314ba8267c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links are likely intended to host phishing pages or download further malware, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=net+boom+app PDF link annotation
    • https://skykharchono.mn/editor/files/56955225044.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/lejiv.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9aa933aa---wumevepuz.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vusokinuxuzakuxoro.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/91097206429.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vfo848rpa0okmllvjmj44lir0h/7839281217.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/71798842346.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/73288019709.pdfIn PDF document text
    • http://unsersohn.ch/images/file/45567633352.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec06350d52---45521241029.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/45132362064.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/logumugalivu.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/powikag.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/99544907305.pdfIn PDF document text
    • https://linker.tw/files/61516065415.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-5/20210905230554911585.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/93714363095.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87803487010.pdfIn PDF document text
    • http://only-svet.ru/upload/files/45164654470.pdfIn PDF document text
    • http://cke.hk/userfiles/75550864425.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1inqk6r5i76a4p0doja16mr2if/84459062102.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vazefa.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/11284243475.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_off0001664d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664D 19188 bytes
SHA-256: 5d6cefc699dc27c3be578d5c380e3f553cdf25bd140fde1287848f842be71f9e
font_01_sfnt_off000198fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198FC 10020 bytes
SHA-256: df4577f5504c3b29f35d0860cad8eed3dd2e3a68b4ad263685c5d0efb77b8eab
font_02_sfnt_off0001af0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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