Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5780adf811852d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 03:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b660fbaea1fccfdfc91657835bbabfd6 SHA-1: bb4406d2cb120e560b5a54ac0903e1e1e05bb643 SHA-256: 9b5780adf811852d0ae39e5e298246e569df17da6b6ba8e9d8ea0d04cc66041c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are identified as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. The primary attack pattern involves directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cellesekorea.com/ckupload/files/31196033761.pdf In PDF document text
    • http://zgic.ru/!upload/files/55926501469.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mg41slnoo2dv63nnhioh75lcct/9284384726.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/lufejaxuli.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/80909564800.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vujabajibusafofewifezof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd46457e9---regon.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/35835953068.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/55286337779.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/61972487577.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138367e941c1---10796049005.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/35062824713.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/setig.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/26081158073.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/jurilabe.pdfIn PDF document text
    • https://12shio1.com/contents/files/mejifajivamolopesi.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48058540624.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rapexaxerubolivenewunila.pdfIn PDF document text
    • https://windsbs.biz/files/file/genomovubemados.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/62693237630.pdfIn PDF document text
    • http://machulski.com/public/file/8889292749.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/57802179901.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fd0efc09---likadamid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aerofly+2020+androidPDF 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_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 10416 bytes
SHA-256: 035e3ba30822794916ff501fc7c4d80ecbd8f36e458685dde443a344c26967d5
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 18780 bytes
SHA-256: 4c0dccb6dd052cfab4260c3739821bca790519fb14905e3afbd850c5f50bc593
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.