Malicious PDF — malware analysis report

Static analysis result for SHA-256 181b3db9ac41d049…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 19:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a1a4b429bd7e0e00e337322a51288e4 SHA-1: 127634bd60c3ca23217467368f9c11563a2d1eb7 SHA-256: 181b3db9ac41d0494d53881a18c1a677baade523368b71252ac26eee694bb968
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest the document is designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=notice+to+give+employer PDF link annotation
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/67616633949.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6bf16127---pewumufar.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/35953700263.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/munukavo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/rilimaja.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/29333484027.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_661F4E7D750F252C.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/1065088252.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161558fd15453f---98205284811.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/25960074743.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/40737702710.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kizegufipetejuv.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/99166328003.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/zawat.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/41559341477.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/18012026194.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/78688999180.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/refofabivasabamakur.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jasojemapadudogura.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/pakoxirixuzom.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613624b152ba2---vikomo.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/wepod.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_off0000b7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 17132 bytes
SHA-256: 15e514528b59c83a3244afb2ef977f3b5bc1740904ded5316e54be44e2637783
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10440 bytes
SHA-256: c20f3b76ae9dbd2707ede07fcf0e5ee80d283630363d5d08711186b9d912db6d

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