Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a85ab6aa9cac91…

MALICIOUS

PDF

87.3 KB Created: 2021-07-31 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d7ee8a72cc53a2375f3cb6e0f690298 SHA-1: 18c2c1214af51e1a538d0c17ff1f674cb29f21cd SHA-256: 23a85ab6aa9cac915657e127ed96949a209d49df2d4b01a0fed0a8cf30a46d00
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5841

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.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04dbdac9---54152322498.pdf
    • http://cuahuyhoang.com/media/ftp/file/mariwuwagibinoxudifise.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/250ad35defacb8f6305bed581ae6c3a6/82143124237.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kh0ar772b7m9toaspld05g3r36/91426641555.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b743d7d8ad---85646290379.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809381e4f81---64279144825.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a02b27c0---85739605208.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fac3887a3ee603faa0040fe5b9182979/zemubovasuk.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/9024275606.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c0okac5megepqj7rd53nrgoepf/xatolonewiv.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e849fe59c6472d5aaaad52f829f1724c/petozekotagekadaso.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8502283617---39298019874.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ba219363---88052552674.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98f4d7532---71236598793.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55531b78b---gatipariza.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdf
    • https://ksa-machinery.com/images/file/27916621835.pdf
    • http://akinmedikal.com/uploads/file/90773817053.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0e32737e---48023446482.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0799222d---bivukuzifuz.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/lesazoxelazu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fded1e07e---gejoweluwima.pdf
    • http://www.greenfield-sustainability.com/images/files/37684602227.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ged+book+2020+near+me
    • 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_off00013fe8.bin
703e0338a280fc0ae51dc51986139c2ff5a69b3603155c76685ebbdda7382538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE8 10520 bytes

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