Malicious PDF — malware analysis report

Static analysis result for SHA-256 b585dc18d1de6f21…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 14:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a56451bbd25dfa29e985a11efcb39939 SHA-1: 53808deb22de723fd184edf9efbb2c83fe366eee SHA-256: b585dc18d1de6f21e28ebc163578c1cceb3c38e7232078f846de161bccf348a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites and disposable hosting domains, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

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 http://foto-klub.dk/userfiles/file/39403484122.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vboekkdopqusvbhkf3q116vl9a/wuniwer.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/susokugimojuzexowejegoto.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/povawelizimetogiwon.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/489645df3623d9b92046b71c989b5698/83970907200.pdfIn PDF document text
    • http://buyout8.com/asset/uploads/files/15583918967.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d31b7d904ad38a37e197660da0e95c48/1465800598.pdfIn PDF document text
    • http://vucert.vn/uploads/files/zuriwupukom.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fadalegimaliwoligokowalu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95b95cd1---42474191148.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jexasakiwu.pdfIn PDF document text
    • https://sy-tech.eu/file/36355783774.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/14686391146.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/vitoruniporaxago.pdfIn PDF document text
    • http://i-dron.cz/data/file/wufotirijumiwomajax.pdfIn PDF document text
    • http://cutskytools.com/d/files/24088651418.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/sosubevokodofin.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/493928c5359437f285e9a1483afd8e7d/57214930902.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/vivefubozulojapag.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/474ee5b1fc5dfe3664bf68cfa95078b2/murexepabo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846bf313b3---miwenuribo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/873f3e366b6dd4558e2576c6e2e3f23e/zizizovam.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vepupatap.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/74358269016.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/75320053284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pages+to+pdf+on+ipadPDF 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_off0000b9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 10528 bytes
SHA-256: a523f16a57b366906fe0bf601ca70ecff19d4304624ad28d228ea98831c339bd
font_01_sfnt_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 15984 bytes
SHA-256: 23f44793f3d5c7e7698c680e08213d711fab01710fb473fdab79564278de7eea
font_02_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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