Malicious PDF — malware analysis report

Static analysis result for SHA-256 9511cee7acbe3f99…

MALICIOUS

PDF

77.4 KB Created: 2021-09-26 01:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be6b146ca057cc8fb6602cac4c66e2c5 SHA-1: c03927796687dde0f9be3c227409a7434295f98c SHA-256: 9511cee7acbe3f99c7e9124635868acdf6360360fbf1d405c11f40fad9e84d44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of external URIs and the nature of the links suggest a phishing or malware distribution scheme, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/58834046ef97c7f92d33924f7503d300/vifudodiwujumoramiravoj.pdf In PDF document text
    • http://skncn.com/u/files/76706378979.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2f240f48e161e07fbc8b7485c62463c5/wazeduwi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/60517537072.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3952e2f03---guxulexitupojafepasivawev.pdfIn PDF document text
    • https://jetaime-shop.com/files/35951262200.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/52790116096.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekojujorokuvul.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/45881842688.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/57721276734.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/rifejofovider.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/63438353827.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/jebarujawasalela.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/59592019167.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/53686230299.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/350495266.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/ledumav.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/vuribekoj.pdfIn PDF document text
    • http://neteyes.eu/editor_up/wexexabogexegiwogimimusu.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91611265687.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/65559477358.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/gewabixojejepegiwuramobo.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/84426529628.pdfIn PDF document text
    • https://gulamanis.com/contents/files/1207888764.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • http://checopharma.com/upload/files/dotiniraxulotimefodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=java+edition+minecraft+download+for+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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 10612 bytes
SHA-256: a1562d927a1cb775d8b22a5f455bd5b613a092011ed60e4bb21343f74fb23a4c
font_02_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 19700 bytes
SHA-256: 96d900f9178df1bbaf7565f2f13bbdc517cd2edd4ff5032d038db26441c454a8