Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bd11e23aa93131…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 03:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f039a40c313275209015b50ee2520d2 SHA-1: 75f8bd6e78456823b374b1a8ede49a3dced15a53 SHA-256: 56bd11e23aa931315a122691b73e020b7413a5c1e9d64f335d70d9d68b7e7c53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as a phishing trojan. It contains a link farm with numerous URLs, some pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b20dcb0b4eae1e6ed3db432489217fa9/wavofupimono.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/36233814996.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/julerirobos.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/pubukuwazofamufarixanejo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/81815121011.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wararogugexe.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/vakupezutolizive.pdfIn PDF document text
    • http://holzbau-napetschnig.at/25274737208.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/pegumeke.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/91924008272.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd396cb0fc---60017759262.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908171158.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xuvurijulovivumipisepez.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/labejinukorajanoxakukibod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa6aa6264---lemerab.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/godak.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/jutusebadavimetixenidafuz.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88367449988.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ee994643dd08dcb90b50068df9adf66c/zifevazut.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210901_37F0873DA101AA5B.pdfIn PDF document text
    • http://strahyi.ru/images/file/wifutubikisogorozasodefo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/62744783435.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c987ab79---zutavatakifomafojen.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/82441556574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=raised+by+wolves+watch+online+putlockerPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 11256 bytes
SHA-256: 52cb14deb64d0c3e9fb8071e5c01eff5515678fead4b3409de861c0ca3773dea
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 17756 bytes
SHA-256: 17effcdb5fa37a086eeca86d390ac02215ecf835ae70485e1a6caccef7c333bf

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