Malicious PDF — malware analysis report

Static analysis result for SHA-256 236eac6f32e57d5e…

MALICIOUS

PDF

65.0 KB Created: 2021-09-04 16:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc6b5ff8324fbc69106f7f543f557d6 SHA-1: 779569c0b1b772398ca2b66cba03b85f32a34620 SHA-256: 236eac6f32e57d5e8b9c196c2d0ef97824793a64b9ee226bde169d3f491129e0
154 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7713

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 https://zapcdn.space/web/img/podborky/files/71952742773.pdf
    • https://dm288.com/slicice/file/24277251003.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9dcdu7juf585cl4h8knl35vnjo/xatikigolerabebabuwoje.pdf
    • http://kibbkw.com/uploads/files/jutukudozo.pdf
    • http://demirlermetal.com/resimler/files/vavesabajedomakuzenat.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7629ef41---digunefumirapetimari.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/pojonoj.pdf
    • http://banglenhospital.com/UserFiles/File/43647749043.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/47867267195.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b267b96b279---basiwuwebunazavosu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7147d421e86e954cff0f3452ec4f2435/56226895348.pdf
    • http://theflowermaker.com/uploads/File/79447627057.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609082832d055---dorizefiwixe.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082498aed73d---59590616484.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/96155130685.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/45807125868.pdf
    • http://www.stemcellhairclinic.com/files/files/30259108503.pdf
    • http://taiwan-casters.com/userfiles/file/56743963011.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe00bb09e8b---tivikija.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f61d80489904cc8648e4665d72186c8b/bategabuduzuboxuget.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a732a274053---90037997534.pdf
    • https://ctsgroups.asia/images/file/jumaximuke.pdf
    • https://lazerom.pro/media/file/70515888951.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/48020883927.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_075054.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=zhiyun+smooth+4+manual+german
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece0.bin
bfeca8d44cccfdde8af959dccf04dfcc1e3c4a9c5368acfec1541e82c6d39499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10812 bytes

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