Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc66f96c4f374078…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 06:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7b9ea348b4a31ca5a4fafca8b1f114d SHA-1: b416bf45d00cf3970b38ed615ceefb4f3dbb4163 SHA-256: fc66f96c4f374078f02ea6a18bcca42727deebbde1b8a1dcf8407430f9607c2b
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://giustofiori.it/file/9182223276.pdf In PDF document text
    • https://wodepcb.cn/uploadfiles/files/miwagoxutozo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e5702974bee---44501584801.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/84332704726.pdfIn PDF document text
    • https://bdcomunicazione.it/file/72207543409.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/jolevida.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns9lk6j1ataen90krkt9jmk675/59279400351.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/91247126358.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3481f717b8935a35ac554ce4be8b9384/33314486702.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zosinekemu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/76655180745.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gexuxodugaxiwenupab.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f4a1fe87---18526092737.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092165c60fd1---nifadek.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b634a6d2212---zinavijid.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/xufodasireruboz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121b454a574---3436426037.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b147dca96da4fde69b75504971b4398/kiwudixow.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/on33149asvl0c9p20u6tutu6b1/kogumef.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/18138433635.pdfIn PDF document text
    • http://sns.hu/_user/file/98373765055.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kebazugigadifufad.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/zagafovivajapegofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ten+lessons+in+modern+chinese+history+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_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 17848 bytes
SHA-256: c1612cdb9f4e9fcd23982df64753d50df7cbc3de7eafebd7c22501bd4de80b2f
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10800 bytes
SHA-256: df14cab5480b92c083dba56682407469502679ae5f1c3cb04cf03d18e25604a6

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