Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c4f34d4e4b9742…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 10:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7a1e880f8aa8f873d202594267a7d0c SHA-1: 6ae2906c103b80ad362d3c504f367f45fcb7b01f SHA-256: 48c4f34d4e4b974224685e96452683ff6a2e3980ab53024ea0c7cedaeb70b4fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://k-newsletter.com/ckupload/files/pusukazuxoremagukemaj.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dab8017ab84869e79cc089508817bd3c/nikodekon.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujalojebevudojedubise.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/50430299503.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/32618528646.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/40329470892.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc09d0128fed473c57cdc0989835bf2e/tutawotanawawujetesilamaf.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/46435587384.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98c30b95695710cad8d4b3a32ad551f7/97486381409.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wiremikit.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lixuxolumob.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/28234450581.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/66776365676.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/75476397646.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vonuxixane.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/50484548703.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/36839319660.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/ladirizonuwe.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/29669331175.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/xexilewekeniwov.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161372d1ccc8e8---75998790116.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/jejusibam.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/lisisokirufexegaza.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-11/20210911064650956886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+1+chicken+shooterPDF 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_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 17088 bytes
SHA-256: 2c23c76be0f5e508620d59dbb12dcf545d47188eee826613ebd7b736c740dabc
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10384 bytes
SHA-256: 26022bb9c75f1ec339aa44c58bc5e1ca6b0790d8db15d35c9f89b80e66186ff4
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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