Malicious PDF — malware analysis report

Static analysis result for SHA-256 198bab9f8236a660…

MALICIOUS

PDF

58.2 KB Created: 2021-09-28 04:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b1d40b62b2698ca5d45d3af2f99f5575 SHA-1: 223d2a5360a6896c87b729e755ffdfe15c193132 SHA-256: 198bab9f8236a660a971468c5d993425e92aa65d9da17031cf7ed3abe9c2fd88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to host malicious files. One prominent URL, 'https://oniceh.ru/uplcv?utm_term=download+vn+video+editor+for+windows', indicates a lure for downloading software. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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://oniceh.ru/uplcv?utm_term=download+vn+video+editor+for+windows PDF link annotation
    • http://naturallabs.fr/userfiles/file/67252539009.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/wemobedosegekefos.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb20fb07c8---konusejivipu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/70428808050.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/59781887903.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///gadixixoxobuperuj.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/7412543251.pdfIn PDF document text
    • https://festacontinua.it/public/file/70078544238.pdfIn PDF document text
    • http://tabletopad.com/images/file/toxuvolorijamotati.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/30844192643.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/fajazafipar.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/rasezozejereninumaz.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nikutarujobikaxazisej.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/legobudikalijezi.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/natowarojajunelilode.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130904732256---37190240518.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3b8e7126---jomigisimekufijefaf.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/95902171977.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/47571389230.pdfIn PDF document text
    • http://tecksco.com/upload/files/2990955741.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/fegukodozajel.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/27537364070.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/67514973456.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2ac821b471795b89dc910130af524e43/25334686769.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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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