Malicious PDF — malware analysis report

Static analysis result for SHA-256 2251f45e20d511c3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b300973f7bff620cb582110b1524690c SHA-1: 2ce8711b4c5f1ee417933578725a0f03b049c2aa SHA-256: 2251f45e20d511c30b837a7bd107b3e7fc7c28e9944113ac28c862cadd5f2bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external, compromised sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://shriayurvednagpur.org/public/ckfinder/userfiles/files/lunateve.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bd4a7c72db12faeb8b2a99d923b0c7c1/vimuw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bcd2889e---92080267213.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/67263323451.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b527fe7432d---87927084644.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fenofemuled.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160826ef2eac5c---21328558548.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160870d925a8ef---47759022659.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutak.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/45565007688.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zowejij.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/bujokupizelupuxole.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/kaxepexidefazizixamesow.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c35305b2d3a---rinipezojag.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/89308781101.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/87799684309.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161204d128f3c5---15739530749.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/74797663806.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf35b0ba3c---25168455150.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/40373296953.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kimikewomupem.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/28966257398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=essay+questions+on+permutation+and+combination+pdfPDF 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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 11220 bytes
SHA-256: df1f34911e78f5fbea1115c8f4a908da632a65e7a9e9379a9b18dae1108c9dbe
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 19596 bytes
SHA-256: a711e6abd7e98c782f029119b4f010f8c0058362517d3dc01f0fa8ad9bc2f5b3
font_02_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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