Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d9752e20cd624d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 15:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa9b54feb4361dd1af0da3e7e5c2185f SHA-1: 0eb6c51721bbfa0e3c1e921961cfc4b7226c1648 SHA-256: b3d9752e20cd624db8bdcb2f3ce6209a89fda05fff8d9fca82a15e0d90c8c49d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://cpghollywood.com/userfiles/files/67637784084.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0254a0f1---xuvelofapudilixoxufika.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c5b157bdae5052ab6ea158af1005e78d/rarajowozow.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/16248801448.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/714f8a6288e4425fccdaddb8ba667c34/porepokilibivixojefoki.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/41215912197.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c20r1ov2uq7bn6rlf4vrlula9t/supawofofozejelakoduboziw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e3bd6539a3deb6584c3017ddce03ed56/84979247180.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/sowanokuj.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/jelunopewomotozadizas.pdfIn PDF document text
    • http://talleresjpg.es/img/file/novukepojirepi.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fezipo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54384880755.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/97a832j0u8kpiptapmare7ppk8/delavul.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/49497286522.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093457a1c7de---55886082030.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c79f19ea08---jofud.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fokuvavojodadimebod.pdfIn PDF document text
    • https://luminex.pl/upload/file/bigererinanozobubed.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7c5c0b2b25f08a95971354707470b732/duvufexeteguwumatanube.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kesizolixawoputod.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fb452497f7f0683694c1b99da607808f/78176861179.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/kuwureresirujosuk.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210827152424.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/fc4bf9a15d03e50334670a1fd1a68998/zixobopubuxapitoluni.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5gqetkt6gcqn1eqfl5rmq5grkt/jupedozitetum.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/konipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=abb+contactors+catalog+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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10692 bytes
SHA-256: 9cc628ac5acbd06f5efd8c9224c0d10ff992c2ecb849f3266aa1773c39885796
font_02_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 18540 bytes
SHA-256: 591b631c9064a230f471dba2c43e530728aa9f56f7032cd34e04b6ddab3714ae