Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4dd4deb28b6cca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 04:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c45160b10b97a3398176d259719666ed SHA-1: 7c692fb47690897369762711c5eab2dd08a884e1 SHA-256: 6e4dd4deb28b6ccafa0926ea12d080b6cbb83bc58a9c8ae42f4b6b162467d29b
164 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, forming a link farm. ClamAV detected this file as a phishing trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/23522491422.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610f69a79016d---96300459010.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40748142735.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/53641172545.pdfIn PDF document text
    • https://ottopianos.nl/files/7329351985.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a07e797ef---zomibefovonesagewik.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5866d5e485---kukomipewodisenivawero.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/mabuzasesunobefigo.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80848655918.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v91d2j5gv5m2cdv4hrq8r5b3j0/tunojizalebiwiwa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f33ae46e23b---lelewex.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/padejifuwitewenun.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060111135473499.pdfIn PDF document text
    • https://aildf.in/userfiles/file/71539416760.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde8278c33---45474280248.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160927029b4d80---tebamowof.pdfIn PDF document text
    • http://jarosi.hu/files/file/88313785727.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1u9rgor1hmr68h23jictaf9o24/43689558195.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4edcd8832---71593199304.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/nebofuzasazapafomolimewa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b6728407ef44a56dfa7627a462c4e6b4/92861021445.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/10468106736.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1fa5f248c3c0e67f3d4d3d467e80e2a7/13497487242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fox+physical+featuresPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 17904 bytes
SHA-256: 9b06eb49f3eb015744bed7650a474c521fd19b1d418ee6ad17e8081d54526d50
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10768 bytes
SHA-256: e48be20bd1549721465e8b47cb231e42116ce7c8437c8b58196cecfb4f9cab2a

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