Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb493752e4582cb…

MALICIOUS

PDF

60.8 KB Created: 2021-09-06 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c6193946e69896a0415730bd72d79f4 SHA-1: a25823cc643bf64cbbb71019e7b9eda0d781a707 SHA-256: 6fb493752e4582cb04d663ba75a77f3c67ac9e382d211ab88ba7ee0cf38023e1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to malicious content or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7488

Heuristics 6

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=conceptual+physics+answers+pdf PDF link annotation
    • http://accomplishtheimpossible.com/userfiles_ati/file/dupurelogiwitoma.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/24246748709.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/risumiri.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/46611166674.pdfIn PDF document text
    • https://fallsplat.se/file/79384406555.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ee9be9f58b4f115c04d2754b2861c500/jotopibofek.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/sekarivupagapojisekunu.pdfIn PDF document text
    • http://nenorm.com/files/files/3248525549.pdfIn PDF document text
    • https://revive.fashion/upload/files/gemegeledu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c003e73b6e6---92867472323.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/486837136.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcedfe6bd2---losowugusuvogomumuje.pdfIn PDF document text
    • http://wajl.net/img/file/202171401027.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc11ec5c2a---60653705298.pdfIn PDF document text
    • http://www.asslar.de/downloads/fezalumokepi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c171c735858---nonetowoxagez.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/61129399173.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa6b984676d---31684201668.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/12496779470.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961018652c9---94331628537.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/rozituwozi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e130c2f3ddd8a17722ffe64eeeb7e24e/27355974665.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/69768584494.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbc2821ca2---zedobemuxoz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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