Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f6c121d9a18ee4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 21:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b492e96d0fda03d39fecce4a8894388 SHA-1: 68b11b98824f7edfa91b1a3121f000e6e957b5ea SHA-256: d4f6c121d9a18ee4d14322bebf29556a78c9fb85f6575e703a3cd49666330b80
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vigova.vn/Images_upload/files/69890503247.pdf In PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/85280067893.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/140862207.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba7dda21e7---fozetiwogesixutinif.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/wedewuwojijefi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/28982116373.pdfIn PDF document text
    • http://yuli-china.ru/d/files/tazitixijixupibas.pdfIn PDF document text
    • http://teresachild.com/upload/files/bakuwagafexegivuwi.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/borofajalojirufegokima.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f45425b01---3181321889.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/kulogubimikoradowotopafij.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/jesuwofireko.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613486b3215c5.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/11577652567.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/49395089918.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/11962521790.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342952f095e---sipemobifutozolefiruboxa.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/pejewogif.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161407a3374bc6---vazilegakizesiti.pdfIn PDF document text
    • http://knipia.com/userfiles/file/27418700442.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/677c455856f988e42aa0c61bf0f79909/bukaxexazoronefesotowana.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109011514061635.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/83402456166.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210909_D659760585FB7B66.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=io+guards+fortnitePDF 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_off0000b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 10532 bytes
SHA-256: 5ded2904da4e89171f9e025b404873d19c1eb6756e6d884dcb257d66352239e2
font_01_sfnt_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 16788 bytes
SHA-256: 8e5f95593ca4aaac64625529e95ed71f96403882b9a4ee714bb31d37d8704dc8
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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