Malicious PDF — malware analysis report

Static analysis result for SHA-256 4675d388ac68e967…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01dce3990dbf2f705c60e6fc537a6e74 SHA-1: 805f5c122db21e89d15ff2b62a61fb3c53e4f2be SHA-256: 4675d388ac68e9678507e828358cdc37082f64ca7f1dbec585e6c4f1ae1404e5
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160911df29fa52---futideri.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/14700724118.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f7p04rki7nbgv8er9qetgt52hp/53641168113.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/likexotuke.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5lanlvc0c450suoi5qqsaraa4/33378747165.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ddc3cc09---40447039853.pdfIn PDF document text
    • https://europartner2.pl/uploads/zibisek.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/jadadujivuzilafubotikuzoj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c3cf08e8---86439671575.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/47774953100.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kv24atkdpgs4qpbb4v47pn7oqb/fobokemome.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vagaxavubokesazefobamiv.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69270074097.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/63053312223.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e68idu4gep27rrl93hacjnpucj/gonukesexadanapogaxe.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/xufubisizirozaf.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/30679677501.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/pobivasitatoruvod.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/iopr5a59js63pfle7bgtku6cj3/fizigudu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/677e2c867d6ce7ce709f26a25abf71a4/libelute.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d50d63972---57505203999.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d99ed4467---67099647600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=where+did+the+cherokee+go+on+the+trail+of+tearsPDF 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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10840 bytes
SHA-256: 55080b41ddf7c226a6155cd0cc493bc243a09d79d966521f2a79e7356d53184c
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 16092 bytes
SHA-256: 02e8fdfe12ea2ba0341f7256a550230e82857ce03bff5347efd07c7eb0f83e5c

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