Malicious PDF — malware analysis report

Static analysis result for SHA-256 8628705727ded12e…

MALICIOUS

PDF

73.1 KB Created: 2021-08-31 14:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 97b087363d24f7a851b94fc57e8397da SHA-1: 8f8b3ca5e55a282dc2f4a2df9c490ca1de9afa5f SHA-256: 8628705727ded12ecf28a8451f7ead63856f959bf24a6553577700a047bc5cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1t2jo1amj5fqgf1rh18qmp83s8/viguzivajedezez.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13627535952.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/17864896841.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/22chs5nvf50c2cqt1pmdlv17q4/masazegitajugiribamaz.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/74394240050.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/97635237236.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lufabivujakiboganowipek.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076361936baf---6640250319.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/39660135591.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/39361084630.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/petenefoxow.pdfIn PDF document text
    • http://apart1day.ru/file/68251037315.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tifulabimadirabugusemew.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/28428692342.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5e4os9ksujtfdrgitgbpo6qs66/51076482007.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/68351748972.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2615459f7---pabafula.pdfIn PDF document text
    • http://generaldistco.com/images/file/84503305035.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68e5afdd2---19232233044.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tg5ne4kuf1pnob5g5n49pu2s85/bevirukaterotonabiwuvoxe.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/2736742735.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a6ed78f---famodevunuzexuxijexid.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/62662525095.pdfIn PDF document text
    • http://iwistw.com/upload/files/pijufesojanebajoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=greenville+county+detention+center+incarcerated+inmate+searchPDF 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_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 10952 bytes
SHA-256: 6a5fa1b83c63c0adbd635949ec8bcc4882ee48dd9c0ba4286f544ec10593b5df
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 15348 bytes
SHA-256: 74e2fc12390edce6ccb9666650af4fbd6a27157c1ff3f00176cf9b45754c3700
font_02_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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