Malicious PDF — malware analysis report

Static analysis result for SHA-256 4549a87416a68929…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 23:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 181815a31fdbb741292b3606d9989786 SHA-1: ed083d235cfe3db0727cbc4787ce26b80504b973 SHA-256: 4549a87416a689293ea2718a6d6cb812e30139cae23556b87eda99593cf5e1f8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious or phishing content, potentially disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.julietlandau.com/fckeditor/userfiles/file/zepiwomezudap.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ba7d6afb0078674ffce50aab9a2bcb74/74052493336.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04279f0fe609c49c19bf820bdb97fdbe/56311004427.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35f99a2ac23c83feba8914877fe0d846/30022202041.pdf
    • http://zjlytl.com/images/upload/File/34545751934.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/49toia6a2ed8bebe9o3eosubt5/basutudedurisetibi.pdf
    • http://bettynblue.com/upload/fck_img/20210522/file/27262459779.pdf
    • http://sujitonweb.com/userfiles/files/wijiferulipoxog.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebc7f36b7---62207478162.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/97160380618.pdf
    • http://mgocsm.in/userfiles/file/vugupoda.pdf
    • https://anakaygame.com/calisma2/files/uploads/81477864925.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/82415971892.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c2d7749b376007228bf9d3f77cd58112/4418514769.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/35171042828.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cbbf332829ced7a2d24b519ea0a18058/2049727700.pdf
    • https://salvatoredivilio.it/userfiles/file/xidov.pdf
    • https://sbsoftware.ro/admin/userfiles/file/37039938410.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be7904f8---73479238980.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e27847a35d0798688dc8f9fa005d6d59/87829063504.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/88280586c8b97b1c33a31545b9c2e57f/45844995462.pdf
    • http://lateonsettay-sachs.org/userfiles/file/joxivaz.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833b92c5f60---xuzaxodinorada.pdf
    • http://monkey-do.net/userfiles/file/1991287290.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f55b905ae2---43111857716.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=serenity+capsules+pdf
    • 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_off0000f71d.bin
b28aab3c60fda6e83220c664e8255f25c1115c5a192fd1ed3755c7f5f61c8986
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10780 bytes
font_01_sfnt_off0001100c.bin
fee4b13b5531d622bbf4f58f1387367ad299c896dc11b656831a515fc670129d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 18784 bytes