Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4a74ea021cf6df…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 15:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c51db4baa26758656fe99ba60de92a0d SHA-1: 3e1a67cce9e21903f854969ea366c321b2ab7032 SHA-256: 9c4a74ea021cf6df3540df0cba3e031872d472b0bb0806b44ee4a92434039e38
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=peitho+trial+pdf PDF link annotation
    • http://hanarotalk.com/userfiles/file///zaguparufikopi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf18cb663---3405094489.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/xukopekemetanamol.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fbd8ca6deeabf42f0ebedac92c4271c3/91308008051.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3f9c68e28ea66f747fd94b9fbe5c89d5/fatawefofotinupe.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/54275390113.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078df891c0---sarotutenupagut.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/wisevudafofivuzi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32edb735dd---gumozewewobinusejejudib.pdfIn PDF document text
    • https://gilbertems.com/videos/file/33673797377.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/75220906726.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/10895799404.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kifarojotikapifuxuma.pdfIn PDF document text
    • https://cmoretv.com/userfiles/19863026304.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/13081081749.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/71622309907.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/doregasileresukepegigali.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/73158748746.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0eb2f681---mibonexugafebitupu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zazapopatapusexivesedu.pdfIn PDF document text
    • http://secretinvitation.net/images/files/gituxazenagibiji.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2b60cde1---mipiwuja.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/65595069170.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a1d26d431---kafunebomagupuvonaziwel.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/lubavuzoxe.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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 17756 bytes
SHA-256: 5fd6ca1a0ed293457897d5cbcdf5a89eb8156ec338b62e60f67309137f09ceda
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10324 bytes
SHA-256: eb9d93702a5454ff16353fada275dfce50f80f578e8c669de2920811443759e7
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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