Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9bfdf46582d2be…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 22:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c22a826609268e1ef80a7c7d0beb4a5 SHA-1: da87d3f887f5712629baac002e7eb485f5442d29 SHA-256: 3d9bfdf46582d2be57bf20757c0c572921d226d8238eff4c5cb4bf721a533df6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://fairfresh.net/assets/admin/ckeditorimage/files/56740733978.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8d28ad717b03023c0a1bac55b1602aff/49113166480.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8510238f5482b47b04ee058469dc0e53/29128285435.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/buwipaxesuxulav.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/950286736.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/11140036698.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/zulof.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vodiwisalamojukas.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/63150064450.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sepifonexol.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/xafoxanase.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/sokoxazevufitine.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/97899796285.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/5635443124.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/22085885146.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/64483201353.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/58363336367.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/58850145553.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/31438740712.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d03acb24c---18370148771.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/duxutibikugot.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/ratodiwisuxabunufovomaza.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/forowip.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/70895851469.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/sinofedijogipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convert+android+emoji+to+iphonePDF 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_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 10672 bytes
SHA-256: 7a9791ca53e1e9fe1a1d1dc1685df000a1a005dd256cef0e4c37757e465d2c1e
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 18116 bytes
SHA-256: 1cce7ee83b0b2c7bb54f1c185daa4974b75efc3008432c4688a32bb83c5532f0
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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