Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d56ec5689e16a18…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 04:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13a237386e3aacb9ac2bb0a07e5ff749 SHA-1: f2c634bcc38f42bcf519c481fbd83f00507506c6 SHA-256: 1d56ec5689e16a18d45a1c2224bffcdc0e609c75c4ef8be930fa20cde61d2a12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5833

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://philabc.ru/uplcv?utm_term=list+of+phrases+and+clauses PDF link annotation
    • http://ipceurope.eu/assets/file/kalilimurore.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/diboxotizatiraduvirevaso.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/teminaxunir.pdfIn PDF document text
    • http://yongqingtech.com/d/files/livofepuxedonixazilofizos.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/be47a0d71b2950d65f6e320d93362c24/nigaji.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/39688062905.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ac3b8a45---70547264333.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f3bb0f95---4716907069.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608518bf0a134---97281820367.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/97788459497.pdfIn PDF document text
    • http://22743333.com/userfiles/files/gijunixuxajikizudiwin.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086024324c53---larozowinavezifewasujuz.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/7932450775.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f74750e74---65997325175.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080221f2464e---10918298194.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/crdaf9ul3sv7otl11sd2rei7kq/wakinune.pdfIn PDF document text
    • http://getem.pl/files/file/18814683241.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/70670364952.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb5e119bb---vedizekizali.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374896cffe---bivaripamusexezu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/634963d744b54ee4b6f8014f9ea9cc50/vijofokopefev.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721707d3535---zufekugufolabidomikera.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c4fc04d5eada4b89fb9ff185c24b15a0/40983280975.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814cbc9fdb---99204481019.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_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 17088 bytes
SHA-256: 1823b3a08dbb9874887350519c349076c9ef1998a6b365f0ed1afb2e93bb92e1