Malicious PDF — malware analysis report

Static analysis result for SHA-256 90010a50462e24f8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 08:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 286ef3599602df33eea0383126d0178a SHA-1: 7ad74554ee130bfd76cf74f77eaee64df68e8b3a SHA-256: 90010a50462e24f83f03067d132f0908983ce2ff1d0c08b4983740d03205a0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many hosted on potentially compromised or disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/kiwulaxutag.pdf In PDF document text
    • https://galerie-louise.be/userfiles/files/30382100287.pdfIn PDF document text
    • http://dentherapia.hu/files/file/titegutilefim.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kagofiwigajijunak.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/fenilos.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/23179938688.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kivulukojadavuri.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/58297286485.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/26773226760.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/boqpqcq4g7okqcoj9u8v5ro1mo/15844871258.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2cb3a9ac8---tesikazax.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/15259664994.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7db9b785d658964703f06836ccf5c85d/budufupujadizotoli.pdfIn PDF document text
    • http://tfforming.ru/d/files/rugepedijefuf.pdfIn PDF document text
    • http://springbook.no/files/60970533855.pdfIn PDF document text
    • https://clubon.top/uploads/files/fuginasizupurem.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wapiniwoliwawagevefeko.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeabc22da---nogupebejetaxonamas.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1672d8054---87206789400.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8472326da4---tekawok.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/65241610041.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/45a353c2ad2ed83ab9a7c2123528fec7/2191094724.pdfIn PDF document text
    • https://animaliadielisa.com/file/jegigutupokugunasuve.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/28966730531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pedal+in+englishPDF 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_off0000bccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 17164 bytes
SHA-256: 6bed0a976c9c50ad212be622d9afc1c389a613dc6c701edd7c80875f6b2fe202
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10212 bytes
SHA-256: f011fd778c4fa9e189685288ea1c96c6c44cc8fa93323df9302e5595a72e920e

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