Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf15ba141c8e22c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 09:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e00b93e29ef956009a9666835617d340 SHA-1: 30463503b3f5e642b95c9adacc5e538a65bc03c8 SHA-256: daf15ba141c8e22cb91bf0b076aa6a2f862814527b680bdc911d14c1bb8fe702
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting. The heuristic firings indicate a link farm designed to distribute further malicious PDFs, likely as part of a phishing campaign. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=disable+emergency+alerts+android PDF link annotation
    • http://cerrutistudio.eu/userfiles/files/tifopusuvonekasik.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/pivibijetixazujeb.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/60510194294.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bavevatanurivifoja.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/25899259795.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/58001702945.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/metazojozoxoketifoper.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/39336205796.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3tps833cho9mfdm34csi0lgkrs/katiko.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35962748329.pdfIn PDF document text
    • http://landpas.pl/upload/file/gurirarosevorizebefokuzox.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/93489444550.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/segipu.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/28578619834.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613998033d62e---91388300126.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/72839938336.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/lasijipuzov.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b3e3ca49770cc0b93780abcf5644941c/54807001056.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2d89bf25f28adc0ddb89355febd66b50/livizajinoromitujola.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/65877311407.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zalisofupokojoso.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0fd395d8---sesuperuwi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fimiwebava.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10968 bytes
SHA-256: 2228d679e9806456f304da724e0a0ff8a16d4d32aed482cd9e3af61ae2b0ccb1
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 17668 bytes
SHA-256: ff618c8b5b31dbe16021db9c7875e02ba422d2df57998d160730fd61cabb560c

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