Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4edbe0092ea4664…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 17:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7aa69eaf679d2a09066d5c938ab1fc51 SHA-1: ac051bc287eabb525ab1a2da45ef8447c9f35c56 SHA-256: d4edbe0092ea4664820ac1ccfc36763acde018ed3f1bb5c91c6acf3b7959b812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=dorothy+must+die+pdf+free PDF link annotation
    • https://cartolmania.it/file/47771729434.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/wixewaxexugibixifesetovas.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/dexafijutikofuzifinuruso.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a98982ce08d---vagovonijotizatinaki.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/6028117814.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/4585097030.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ujhb943o1vf89h0c6sqfv1737m/46082771727.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fda7996f26150401507bdd43ef8f17ae/zilozakimidipilewoku.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/mulewapatiboluwe.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wolige.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wigugidosetexivuwi.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/nukoviwuvufukapituzudona.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/xesatuf.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/924f507b08d3d5943258d5f2e593a956/lozazosakigum.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b599875f---xasipuwunakimajowudok.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/pulazabiwoworabiselagewu.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/wufopovujulituwe.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/47328153352.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/xosivogolejetopo.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/7479990524.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df64084b60---wusekerenovafisorok.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070206796c25---13357285549.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/68455713022.pdfIn PDF document text
    • 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10668 bytes
SHA-256: 22a656cbb375366a8f83bbdd22d39506dc8420cf73529bfe4d9c5bc0f11b5c69
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 17920 bytes
SHA-256: 63b8fa06c8af3b819098fccda24a6c8a434a0df08bb327ed16af4837683b1d31