Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e182fede2233d88…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 04:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23c6d8f1d19cc7ed22f151db01efdf15 SHA-1: 9a23e77d103fd2f8422d296953f59907e5fee3b0 SHA-256: 4e182fede2233d884cf0d520797ee513310e0ddf21d6e0452cbef733685dc025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=narrowing+of+right+neural+foramen PDF link annotation
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6849d992be16ad6af20376bfdb083cc9/gulinowewisubu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hsb1c00qsc4qlb6nvs3kjls3t2/tazixinapifimemodo.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/laxaripuz.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e222f8356e79127523a09a129c6a5248/togemevubuwoxibape.pdfIn PDF document text
    • http://alvitraders.com/files/99487128227.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gimekuvebesakunimif.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a625b29a---retexokobiwuduraj.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/9349143552.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79132836638.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/53348635620.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/juvamewitagikebam.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najakasedisamiko.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085597101462---82618026151.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tebevisigejuwekopa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/3734566543.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/88412465689.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/gekezefasarewoxesej.pdfIn PDF document text
    • https://olterus.org/contents//files/lawagexagukazabev.pdfIn PDF document text
    • http://chayka-svg.ru/files/zidex.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/72395692444.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s7qa4aujqao9q9aguiml2070u0/guvaz.pdfIn PDF document text
    • https://triosms.com/userfiles/file/20932060345.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jijarusuxewikalexologile.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4da380bea15e688fe7a61444f2031754/rezufovamazal.pdfIn PDF document text
    • 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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 17144 bytes
SHA-256: 8f112eda1179d2f1988ed8dd3cdc37f9f21f70f5c79e899aeda20180b386e043
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 10656 bytes
SHA-256: f135aba5c6bad0e5366bb35ed2031c58559ba571e4ba48403b6edb7c5edb031b