Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91bbbf32b40d6d5…

MALICIOUS

PDF

84.4 KB Created: 2021-08-14 15:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 005b1135a1f72775f0c7002216c366c7 SHA-1: 6b8174f691bef77c509860dd02670b8386be604a SHA-256: a91bbbf32b40d6d5923607d878bb060d28e1ba545654696b774cdc4eec1ec243
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gift-founder.com/archive/upload/files/lamakesi.pdf In PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45202461528.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/24286072177.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/6769447732.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/jukibesaliziwefurelowide.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a62e1e37---73810391302.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/jakanewipuzigapuzifi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/53073986674.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16109431ba44fc---41163415249.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lewoxodutux.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/tuwaz.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/01a57b179f838c18db8e259c767ff2ec/zomesorulevugo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a63d9205---bajonemuxuxusozule.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a866f6a91fe---budakevodugim.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/94949291648.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d43c290cc207111f7228f2c8901f41bd/70140263794.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/ribipov.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/73m30586qpajqoo3j9611coflq/96793706750.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/ravopukujimibiworepivab.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123e302ab0c---78340593481.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/38375276650.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/funalovuv.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/97032429749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=resumen+los+hijos+de+la+malinche+octavio+pazPDF 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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 18412 bytes
SHA-256: fed69b81079a95872ca1916d1588b2c4959e8443f0e444ec106bb7e23e12ba3d
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 11080 bytes
SHA-256: 044c2f1cfa0e418b6f3cfa60b3150437ac91654baaf1a5c48c7a1f85f98b3111

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