Malicious PDF — malware analysis report

Static analysis result for SHA-256 0448324da519f436…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: abe867a33bda1ec737ccf166d0cf0a0c SHA-1: 6157108e33dfaa23fe030e64ab3bae7936d6586d SHA-256: 0448324da519f436e2f624fbf0d131f0c67e350c16863e352d973850a587fbe0
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. ClamAV identified the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a malicious phishing or trojan payload. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a primary execution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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 https://wastran.ru/uplcv?utm_term=clash+of+hero+hack PDF link annotation
    • http://studiofapas.it/userfiles/files/4170702987.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/95505550968.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631496761.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/19036510717.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/49407788408.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131902611095---sedaliwaxoxinas.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/xuzawiguwabovuremedasub.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/70472211893.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/19830457449.pdfIn PDF document text
    • http://rs-entp.com/upload/file/68038606612.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dibijobepaxinonevezaf.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/14132642059.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/76113020472.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/10232797091.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5678c7204---tiliz.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/xexon.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/82573112993.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81c46e48---57115277496.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/43970514586.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/53261729826.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/16382435401.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/38953409137.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/96574560885.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419236be7c0---xupomilemewuxug.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 17956 bytes
SHA-256: 44ae70c5e09968dd4831293578dadf62c9d57c6bbb5d41c106d0286d40020996
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1