Malicious PDF — malware analysis report

Static analysis result for SHA-256 2524df7880c0d45d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 08:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84e24621d3d88bb9a615ba78e27bb07f SHA-1: 5317f3b05aaf30d7f7bab0b76ed49e89689d8df2 SHA-256: 2524df7880c0d45daf350129517f3c021c442813b71a27d6064202852215ae8a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for link farming on disposable hosting, often with UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the idea that the links are hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2445

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=zombie+survival+offline+games
    • http://thayloilocnuoctaihanoi.net/upload/files/6829313655.pdf
    • https://basisnomor.com/contents/files/58824999072.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142e440c411d---jilani.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/99105938592.pdf
    • http://loscogliodifavignana.it/userfiles/files/golenizeforamigefazasos.pdf
    • https://cobaltinc.org/userfiles/file/89281626415.pdf
    • http://contua.org/userfiles/file/pujazubugugudapiziwada.pdf
    • http://mail-ex.net/userfiles/file/kikobidovawegaropuj.pdf
    • http://gmkms.net/upfile_editor/2021/files/55190087941.pdf
    • https://pracowniatechart.pl/fckpliki/file/15334696788.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/93942380839.pdf
    • http://gurolmumcu.com/userfiles/file/25257737978.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f776a370e21ff22e41f2ee008cd75cd1/43748957765.pdf
    • http://elsped.hu/files/file/wabulukunijezutujo.pdf
    • https://euro-m.si/web/dokumenti/file/mikurimizu.pdf
    • http://cansuyu.org/resimler/files/33157326492.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/39611284934.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/6460035533.pdf
    • http://digjamaica.com/app/webroot/files/31770333535.pdf
    • https://next-engineering.com/userfiles/files/4138259107.pdf
    • http://www.icareonline.net.au/ckfinder/icare/files/4024412630.pdf
    • http://mdfgiare.com/upload/files/35694190010.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0j6j9a2tfeokl75fie9ul07ob6/tosebupujugokoli.pdf
    • http://atomiccm.com/userfiles/files/wowoz.pdf
    • http://euromarkcreations.com/new/fck_img/file/gipudinajagawomumilade.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401b248e653---kemawexo.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.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_off0000e550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16792 bytes
font_01_sfnt_off0000fd67.bin
efc632852d671a3ed73f917d6849d72b7df946159e594dd3f70db6125a0858a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10728 bytes