Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5428c827278399…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 07:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a78f3fdc08b7b36dc09709cc956294e SHA-1: 01e06a67972ec1e099d109fd5d75528e94eecc35 SHA-256: 6d5428c82727839919f47568fbeee6088818af2ed437404491d4c8d06f1a38c6
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c475fa4d574---40733185682.pdf In PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/jewaderagike.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/25c463e695edae953e3f8968cab99fcb/9219899376.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078250447244---33230008841.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/32teq05b0ngocccq6qqv9j1sg7/43583706214.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075658e45058---xotijasixilereka.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/wosusowika.pdfIn PDF document text
    • http://liily.jp/upload/file/20210828070429.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegipekuropafapuv.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/59913670987.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/muvusemomadapowelu.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/tidogurisavowotolu.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/jeturumimaxuruzinogamamo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210614104203_r4jnib.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/11187793668.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/vewase.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/59307411492.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/41071894956.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gopuligumomibimud.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/mulevekuzitubon.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16086145d6a1f7---92914930649.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40182770619.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5f69a54158700369c05f4467bed02256/gebofiwubefafakefamazugez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shallow+partitura+violino+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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 17604 bytes
SHA-256: 78741c0dde94074c2e75ae41f717723518f4ff994c4d7d64a7f8a4fa4ed2d3fb
font_02_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10620 bytes
SHA-256: 3f7ca10b57505e38000f9834f48b33e4e199c679f86c1e38d0ff5f5ad4915252

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