Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9c8b575adab216…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2850d565361c593c6b2654e0ae5f6d41 SHA-1: 9ea6a2ac3177725fad7f25197bc2ff308027ee03 SHA-256: 9d9c8b575adab216fb3653f2d97a38b63b70a271dc7932d2b732af7dcafc7b86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://quiltingacademy.com/fckeditor/userfiles/file/xadom.pdf In PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/lozubigopesepojesojukof.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/77727456650.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/lupukifixalake.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/62652181006.pdfIn PDF document text
    • http://babamoleskine.com/files/file/panafuwiloxilu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/31323591757.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gimonuzazirotal.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/pixadabinad.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/23021096067.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/68212501721.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/8899001114.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142887994521---fadaje.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143843d4baee---nagovubofekokinevirap.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/283480406.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/16356310350.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210915181109.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/46633239318.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdb037316---60879600022.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/82532230757.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/45844604829.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/zevuroxukubiza.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/63064614770.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/34195342888.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/38622675509.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f8c384f7229e73018791139fea702393/7716329520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hide+apps+from+share+menu+androidPDF 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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10712 bytes
SHA-256: e08fc3cdfdcdc5806e5744a1cb4a703f1edf10675dfcba3be0c8bd833e85b0a7
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 17304 bytes
SHA-256: ad3d6fe1084ea5a9b04e12e211c5750189a5c42015942b41b5e3fbb4c871153c
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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