Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5af576e6b2f18d3…

MALICIOUS

PDF

75.0 KB Created: 2021-08-10 00:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e10e3c05e09d3ad2b55595f6ff6d06c SHA-1: 6651e0af1ba717977026ff74112387279f421572 SHA-256: b5af576e6b2f18d344f16327a7235cfd475570976d0ee136a36920d4109e166e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. The embedded JavaScript likely serves to facilitate the redirection or further exploitation, contributing to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6079

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.
  • 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
  • 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://abbwingslynnhaven.com/uploads/files/vetiregepibirufifaxeno.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a3d19183---20760456853.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vezulanogufukikizaluf.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/59678010631.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/38782988390.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/70053926574.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a06923266b54004d86e05d751104f8d/kadulija.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b20ea6edf---jejin.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8301100d7670e97739bdd58c80311425/72960807305.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42539367867.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2060f1206243b50d084ace6df0d8a8ce/powabivipojojogora.pdfIn PDF document text
    • http://centromp.it/userfiles/files/pojib.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fffd5daa2---62498324683.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/6204151737.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c40f0aed---38099414780.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/49561468752.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11744888964.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/3676144209.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tl6mslh59mnuc9lp2579b9hdj1/6881572706.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708abd59545---nixogaxexo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kewibuxam.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a9c05467f16f6449156b8480c0ec48bd/90637247383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pretentious+game+4+pokiPDF link annotation
    • 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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 18284 bytes
SHA-256: aa539ef4deabb19e455bc0cae8eb20fbb287ea6aee93a86246b86bc75dafd1ab
font_02_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 10820 bytes
SHA-256: bb7edb46cc2e052262fe5595a0cfe4d46131474018422a809d1ca6bc9bb25bc7