Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b4aee2a5674629…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 12:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 396bca23ece56a34a4c6b13245fd87f5 SHA-1: 4bd54038eba04d88282ab4ae2ae19e0a0f6c052c SHA-256: e9b4aee2a56746296d6038106e0a654daf0fd487fbccbb25bab0512e703f3000
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to trick users into downloading further malware or accessing phishing content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=download+yoruba+movies+on+libratv PDF link annotation
    • http://thuexe7cho.vn/upload/files/rewavowigi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/67635410102.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/61121046369.pdfIn PDF document text
    • http://benly-carson.com/product/files/33886696884.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/9386579859.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/91457019159.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/kinawib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ae4e4337fc94d92a5e43e24ee46c180a/48092304233.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30affa166a9b0ef4e21f6ca55e75db85/dinozuwewevupiwumoguja.pdfIn PDF document text
    • https://rippa.pt/files/file/67615033495.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/42803720130.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pugupezizodabaredunapu.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/49412251622.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/litanatolewerozu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/342d041803d2ef6276297709cce46a99/44273586481.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/79183445007.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613608eb75d6e---45830244971.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f92a1b5b32.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jugibilabolufara.pdfIn PDF document text
    • http://preiss.at/upload_files/files/20579213158.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/8307497307.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401c9e6fbcb---88379455251.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/29061355511.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ebd6a9e---23393774900.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389e725672d---tegeni.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fojirijilu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/56524047229.pdfIn PDF document text
    • 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_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 10916 bytes
SHA-256: 0c2a897c9e7f49ced3b98af3d2211df815cf257359314d44eeeadd0bf2c23836
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 17692 bytes
SHA-256: b3cebb762b28c8c746eeb8d3bfdafe1a7af64a91b752a233df9c78f117fdb3dd
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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