Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23b2e7aa1e788ea…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 11:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 92b3c292ad809439e56f052b020de8c8 SHA-1: 41aaefb852d017d6cda1f7c7259766900b522b5c SHA-256: a23b2e7aa1e788ea156a9820c26935e70a486ffcc128146ed1c27d8d6384e3d5
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 CMS upload directories or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://roosprommenschenckelfoundation.nl/userfiles/file/95589918007.pdf In PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16306262724369.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lowubabididibosuruvep.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/74064509536.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xemunubojenoke.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/kujamavafamo.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/58618031967.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/10136453333.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/52631531647.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/rumabalaxagefakuwelajumun.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87390860636.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210909152704.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/duwuvororixagepodidixid.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/19005134136.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zagizuvudipenewi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f031a4d27---93054541452.pdfIn PDF document text
    • http://state-lithium.com/upload/files/gixusus.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/eq2h0g5tfbnmfhn9ok73tp1l75/47004203408.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/65509903419.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/mapuvopelokowiditimesipiw.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/16250758607.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/makixabewotifip.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135d07bb2c5d---foligafefi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138612188117---beremusovef.pdfIn PDF document text
    • http://millecolori.it/images/file/sonosafuvuruvizixizojam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+transfer+games+from+phone+to+laptop+using+usbPDF 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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 18256 bytes
SHA-256: f97928a535ba4cf049e2983ef6e1e721c947b77cf5816ea7a874af17fe45e9a6
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 11124 bytes
SHA-256: f3e1595219df2066d2ad1df105189a69db0e21cc2fa89d18c4e5de9098847755