Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e085eccd0f53dc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 15:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 554b345818d0d5505e3cab1e500d326d SHA-1: 8438ba73a97de6d2338fcd8c77a545eb918b8248 SHA-256: e9e085eccd0f53dc852dd2d72cd821f973b27160af538fce487c99e4c8168f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to disposable hosting, some of which are disguised as legitimate file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=mpay+download+apk PDF link annotation
    • http://yangpupark.com/uploadfile/files/34588762873.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/ruwujosexegulikumapigifi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/sezowewisavefizitajugeve.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/tomexadisumew.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/30511342116.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/74840771874.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dorona.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gabodasejejujesifin.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/simigesakofiba.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/21345060462.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/fovefepewu.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/15090925608.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/mufuxuxaxalolibevir.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89024450018.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134de612f6c2---dixeranudojuwexarusubew.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wonifatogajidujab.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/ritisinotazomusawisab.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/89906389927.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/50401475301.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613306007b88d---vofatudisu.pdfIn PDF document text
    • http://apismorava.eu/docs/legabuxadad.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/lakolufulazepadiji.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/14071683241.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gusitubavuwanipajojanem.pdfIn PDF document text
    • https://j26clean.com/upload/files/96065730781.pdfIn PDF document text
    • http://artio.pl/files/files/35809603284.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9e444835---gepanadixadilakejaluna.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 18180 bytes
SHA-256: b854564a1cb2eaa8e6573e8d57f93b7326e1d75b1c1fb8b7cade4df06c749b25
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10080 bytes
SHA-256: 8653a29b828a88c2d85f53801adbd5461d20cfd007c58aca1c716e626d966fef
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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