Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d515a18d7e80cd…

MALICIOUS

PDF

78.1 KB Created: 2021-09-24 07:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 61e40b134a76f8c27e2f3e3ca92ab572 SHA-1: 616da1359c1a7653be82b1c1d8c2bb28264cc27b SHA-256: 05d515a18d7e80cdcb82e34c25f44109dd9fdec678f3c719253286360db6b8f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=m4b+reader+android PDF link annotation
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/72070710478.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/lanusakimazododoroxegupo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zafajekupirerejimudod.pdfIn PDF document text
    • http://hanleyresources.com/images/33263003621.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/23172398498.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/taxawoguxex.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d576b24d8---vuravufevudulenoxowitasud.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wazijel.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfgku065conqp9n43qtf56nbqb/56692954253.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fisusibog.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb7a99ff3a---vewuwomesovijize.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109151921489171.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24592147081.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/puwut.pdfIn PDF document text
    • http://rotang.net/userfiles/file/57056730646.pdfIn PDF document text
    • http://proxima-design.cz/files/file/83765587438.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61834364984.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/1882506210.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/18688637759.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5012276431.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/96101263491.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 21700 bytes
SHA-256: 31220d96f8a20321d8bbd3c5253d584a98761e1b6bf181a92ab35bc9df54bd80

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