Malicious PDF — malware analysis report

Static analysis result for SHA-256 935043ca478c05ed…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 16:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e991775d54ada707c23e8291a79c5689 SHA-1: d07c290240a92288f7c0fde860230a2b3d184e54 SHA-256: 935043ca478c05ed1708eb11ffd43c4c799a42c319b503fd51a02756f3a3bf62
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

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://archism.ru/uplcv?utm_term=asturiana+manuel+de+falla+pdf PDF link annotation
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/kupiguzofulovuno.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/16463271997.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd29643e4---xutizozadoz.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fiwuketebemarilaf.pdfIn PDF document text
    • http://nfc.soo.jp/file/64142156801.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5aa8d8f7dcbfbe8becdff4703b685ed/jozimokadupun.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zigirosipeka.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609909f837a80---36787712126.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98798465624.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/93695118453.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zomev.pdfIn PDF document text
    • http://akademibt.com/resimler/files/11857663478.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mojumadafenamurotewis.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/61a0880fd67505b683a7121663487e6a/83789793886.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/22030309547.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/16237286347.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082775c6d270---tejiki.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2d989ac38ef7207de51cfcab9d8777fb/kasitutevaxuzudi.pdfIn PDF document text
    • http://planbmedia.hu/files/48928320951.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/77225934361.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075713f1b11e---47276069670.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jatul.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de04b29183---batiramelejap.pdfIn PDF document text
    • 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_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10620 bytes
SHA-256: 5f6129a2bc685fedecffd43e7f087d73d69f29f8f75fe78424f59228b3f32b4e
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 20216 bytes
SHA-256: f661d0ba6ae76d12c4667382e822cf055497554190f382f4c4cecc579c762585

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