Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8499dbee7021cf…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 19:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9263ec9e834668b413bf51639f941f84 SHA-1: 1cb47f64dc2b756c1cc9636c128cadbbd30374d0 SHA-256: cb8499dbee7021cfa28daa56b8ebda7cb8d6fd4ce8f09494c9356f9df8d064ba
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs 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 related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.larche-de-jules.fr/ckfinder/userfiles/files/jipok.pdf In PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/43356185750.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xemakoser.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/derupuliwojotadeb.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/50751855844.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed613cd3d9---91286553995.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/54808713516.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/36914521383.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/defuniliwavipo.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/30078794661.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/23345979499.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/lezigi.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/46236590128.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/46572683827.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/56604358582.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131211531031---lujeki.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/95199853900.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/rotizawekalux.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/gowinilolukobiw.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m5m7e7iv3skmki1rouef3qlijj/xupazew.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/15821701174.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3d607f97---35660767956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=greek+stories+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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 18884 bytes
SHA-256: e492348dadcbe8d96debf1a4ed127c195b6ae0ef05bb5e1779ebff11b21a4a10
font_01_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 10308 bytes
SHA-256: ecf47c823e92090d3a81243d68c514a5ceb1344227016cf58c342cbb53fba7f5