Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecc72390181608c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-14 04:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 540f82eae310fbe513137f75541afb50 SHA-1: 6f440b823a0189b4badfdda993fa7f1ccdb16bf0 SHA-256: 7ecc72390181608c6ac90f14cb6819353a45df84634526cebd4ecf54e68bedd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=lively+wallpaper+android
    • https://yptea.com/data/fckeditor/files/79045492138.pdf
    • https://paeonia.ch/userfiles/files/61733355246.pdf
    • https://infypos.com/infyposcms/media/luxovadonojuvarenowo.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/liwubomuzepepof.pdf
    • http://around-sicily.net/userfiles/file/pufur.pdf
    • http://focalthai.com/file_media/file_image/file/zovujubimebogenosuso.pdf
    • http://bjxbw.cn/userfiles/file/voremepedoz.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/87796807632.pdf
    • https://clickbox.ro/images/file/83358085720.pdf
    • http://edituj.cz/res/file/84500875290.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38262a23d---zozejevavanaputewixot.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3b5a1aa4---48978079306.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/nesonemeruzinik.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7cd2268---10014295615.pdf
    • http://pension-erlkoenig.de/img/editor/file/98947364949.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c45df78d---94063422417.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6d4152389e25a3da5899d8dae7a6d89a/pasozopafusi.pdf
    • https://zbmbudomont.pl/userfiles/file/39292215422.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/nixabivedobewib.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/veregijepamilen.pdf
    • https://dehayemek.net/upload/ckfinder/files/nasuxuxeradejiwibafok.pdf
    • http://billsky.ee/files/file/70191899700.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae42.bin
ea8107e831240b3ec90b5783b30c99824cfcf0e86fb01050ab1594f257f532c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 16276 bytes
font_01_sfnt_off0000d6af.bin
a2006ea4153f39aa14c6b3b653750869e78c0fe760afa7a3c8b6a734725d2b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 10340 bytes
font_02_sfnt_off0000ee21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 16792 bytes

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