Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26043f4b779b5cc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 21:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75c89927925ec5f09dd38805c568a391 SHA-1: b5fbe922d82fbbe1bdbfa2016e3f87b4e10c4514 SHA-256: f26043f4b779b5cc782e08d20916bba9914b6ee3fbe0fc8a8cb3e007514c5a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to multiple URLs, many of which appear to be hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to download malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fratellilongoni.com/userfiles/files/sawegowekikakekenemovudi.pdf In PDF document text
    • https://x-software.cz/data/file/70395395720.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/39020265808.pdfIn PDF document text
    • http://effektfilm.de/files/file/58832440573.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/82090920595.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/vupapudubola.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dd625e5090e3abbdcc9e99e4220ead6f/wututimoveluwepizit.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/86d800bf531e718a2add98ace954dd06/9116070533.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/74340427666.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe838d6ab81---69376219397.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bivuxezutib.pdfIn PDF document text
    • https://equalland.com/uploads/File/venakolerigenejapon.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/73147475611.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/togolekutulotedawikuno.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/69775658286.pdfIn PDF document text
    • http://fteq.ru/files/file/sagiletikuduti.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/79966369953.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/majimofajewasesofiwuko.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607104dae6f45---nuliwesupavalufukujov.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xadiki.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/13474379466.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc1d1a0c8---naxezoroko.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vokarevavojakugopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+register+in+languagePDF 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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10360 bytes
SHA-256: 0162b6120a231d87176b39f3294301808fb9537d38eb4af2bb0f7daa494cf7eb
font_02_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 16972 bytes
SHA-256: 02e3c36612376c3c150706eff385b5de94676c28af057074d442bb97301869cf

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