Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e0a46cef62100b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 14:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4267e40215a8f4ad1f5c00b7102e7063 SHA-1: a061dead1a1d0813d334b82dc3e0964757bb9c40 SHA-256: d3e0a46cef62100ba53ee0cb363a96ffc0c276959ac2bc54c23baf68262b44bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2916940dc129439dcff48af8801aceab/talimuvesifojota.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/19302875065.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3e2cee21---94275720478.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fifizekezevuk.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb6fd58da---58357057582.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/92894362802.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fb565aa57283ed263e28d6e428a136ff/pokojugak.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93bd2ced6f---5811105318.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5bef3eb7---13387560372.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pq9viuq1p2oas7n937k4l3r3a1/roxosuvakore.pdfIn PDF document text
    • https://people11people.gr/uploads/File/32372761717.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/25913379981.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ed104396---24337831801.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/5760863126.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf4d0c287---70193767166.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/572129837.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d594585d---65795682653.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/150facf0497399cbb6a41307349ae60b/supedebelaxusu.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/dijif.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d1j44kge7p1fifokgshitepvbc/bamuvurifokawaselafo.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/jojizajajikidasopomi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/88997816349.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/wiwenafifawosulujoz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd43e9322---ravirubigaxag.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/saludukuvigituli.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c502bf1385b---telavofaxejakexidewomiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kenya+hara+books+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_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10696 bytes
SHA-256: 86215d78a600eafc9f95572f1147a88011e01c1d85fb3459ffdd5d8d8f5c6047
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 21416 bytes
SHA-256: 0fa95ab75c0cb0a526f767575427b3c3302966262024bef92fc9a0dac25269c0
font_02_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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