Malicious PDF — malware analysis report

Static analysis result for SHA-256 3450e395d93c658b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28da9d18f4460fce335f4bc1ef2a4031 SHA-1: 26c9c10544fcc97ee1886050f1f1c2710ea35742 SHA-256: 3450e395d93c658bfa2a31a92d38c18bd812866369d1a3bf2dc3ed092489b507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://krakow4you.pl/krakow/files/soxav.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d0bb16433250297b8c229068ca27f161/94564738255.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/dc784bf658b8451bf5ff1da2271035a5/sijunipisaju.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/litegaluzemena.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6tnc2ce5rc3agh7mp0tj37u8eo/pekulivadisepenebid.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e399b5d73d---mexazaxelobipove.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/20962757939.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/sadunufekeji.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uvnk76ca6nv5csuvjnl4clppb5/tijisukojigixidepo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gamilexabogewofibamovifet.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/eaf960c13374e34f431fb3be7a24fc0d/96760821146.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/93700099866.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijamivilikavemewunopelu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607704a478c7a---jojetagumiliwes.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/67925133938.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a768444fd---35344773106.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5655d20713---giril.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/93601323676.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/mivodazutarat.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/18798101830.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5312dffc---71840803480.pdfIn PDF document text
    • http://fedoro.ru/upload/file/97773519854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bubble+romper+pdf+patternPDF 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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 16384 bytes
SHA-256: a36440fe0a16a7a546572fdcf17adcc6522a5a4fdb203be54c4fc2b11177e1a5
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10692 bytes
SHA-256: 3d9b6cf4f52ed86ef6aa045dac62ee881b63b3349ba29ed468a8bc64778cd2fe

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