Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e5eb481af26236…

MALICIOUS

PDF

75.5 KB Created: 2021-09-10 01:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975a35857e3665ea7c84a697e87778fe SHA-1: 4f215c9f47e079cbba45a0ea0e4c35e1ce8f3775 SHA-256: d8e5eb481af26236408796236278de2ad81e5f9a4ed12cd4b1a06f6d847f4d50
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 http://blccy.com/userfiles/files/40314161221.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161302f2bb088e---31495225841.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mucfd5kbrcfdvtq1ed0ukocphc/90315198079.pdf
    • http://kiuanai.com/userfiles/file/xekuditidaja.pdf
    • https://cobrawire.com/userfiles/files/78444038636.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/11848236358.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca687a799---65139714122.pdf
    • http://shahgrp.com/uploads/57414862786.pdf
    • http://soft-pro.hr/upload/datoteke/jijutenuni.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/namowoxuferid.pdf
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdf
    • http://master-vin.ru/files/file/71508544864.pdf
    • https://leganordavigliana.it/uploads/file/nonel.pdf
    • http://dongphat.net/upload/files/kubafevobogokol.pdf
    • https://bisnismedsos.com/userfiles/file/87231459351.pdf
    • http://karat-dobremiasto.pl/userfiles/file/nuxikopidi.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/mivopunomofajevixixisuro.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/13343231905.pdf
    • http://mcap.cz/images/uploadedimages/file/84967264906.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f52d7b3b---levonabav.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e88df9bf---36532524337.pdf
    • https://groupburuemas1.com/contents/files/46969558134.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wootechy+isalvor+full+crack
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da94.bin
80fb1205b31c574e95033d5e7db48f2e1fc87fcc74d6a20cfaa81a0bf6cea277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 18540 bytes
font_01_sfnt_off00010a7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes

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