Malicious PDF — malware analysis report

Static analysis result for SHA-256 53de5134601a8827…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 19:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0b3c778d469823e1862404641d0c90d SHA-1: cb43b47fbb5d827c08e04796d4ad235bc80f16ef SHA-256: 53de5134601a8827ca94423a5b6171a45b51516f152e32ad6b16745e00c7543d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to WordPress upload directories, suggesting it's a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with phishing or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f46d24b98---77862169933.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2f39d5819b9ef5fcd33f27d65df7f3ad/kuzegibobesud.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/wipoxol.pdfIn PDF document text
    • http://school15-tyumen.ru/f/12084079950.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/47438771415.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/fca727ff9a95d7707f224376d3d78e98/97811978056.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/js0gfegoegtsd4jufla792hlc3/zipad.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/897acdcec7bac0724f7a333b6c1cd337/mozikimipafokexuj.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57ee9a3e---bifedufazeduzebamo.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/wagofirexemogunevuroluni.pdfIn PDF document text
    • http://hueide.com/upload/files/lozesokatipozomalos.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070974e37c75---gulamega.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/97163938737.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vezasiwoj.pdfIn PDF document text
    • http://packamate.com/userfiles/54991419915.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/pelefurazixokaza.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/62187762551.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/wakujelipotigos.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/64032652164.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610cff13b590e---11497415548.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67288657057.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/9934389622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reasonable+faith+craig+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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 17768 bytes
SHA-256: 520ce7e72bbb332f311aa4c4cf27133e943a9951fe78bca2f2533deb8c03e56f
font_02_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 11084 bytes
SHA-256: df2262606388fedd0794aa2931ffabe05eaeaa9c5754197ee3ed199e241db172

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