Malicious PDF — malware analysis report

Static analysis result for SHA-256 3960f0b185fded28…

MALICIOUS

PDF

132.8 KB Created: 2021-09-04 01:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15927630fd3db9af61e7ac73a83a1b82 SHA-1: 757fe45ca27ebdee2d17dd1f049fd1bbc808b6fd SHA-256: 3960f0b185fded2887713c44479d1fe006b941293d36c8a1a2eacb5d4f0f262b
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detection confirms it as a phishing trojan. The presence of numerous external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5713

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://cheumst.com/upload/fckeditor/file/55324860478.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f2923a80---ribijejuxalobujopufedu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed1ebc629---48441671397.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/36810280594.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ilv2f8r9p1dbhgrj1kivc7gq4/18813662254.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/61873158766.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/6053135744.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3844673257.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/beriwivujoto.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/noxiliwelibabeboj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/88857648523.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/98732377825.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/68998058966.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/94369227761.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be41cdc7c66---setokibowogobugajitazuko.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61975529953.pdfIn PDF document text
    • https://biocoils.com/img/file/nelamasusukux.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/netikawevudagofem.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/6d22d779dd7d75a76243063c6de6e78a/33351303665.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747c112fc14---42063796358.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/53771324612.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wulakutarunuvarozerokonab.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/45498709813.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/5841119688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gnu+grub+reference+manual+pdfPDF link annotation
    • 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_off0001ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA9C 10764 bytes
SHA-256: 087a56b923d0d917ec45cf221279162473ab3d5623444f43172baad3a644eed8
font_01_sfnt_off0001e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2EE 19852 bytes
SHA-256: 312ee9a82d7ab77dc1f8b8444089056bf214a1acfca9908e63d3f0e0fc385dde