Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38118373294e949…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 03:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c86321df4cf51399ea6b39f1fd89ddc3 SHA-1: 759a8d8a3a42ad4d20c86a4b3490820d948dd09d SHA-256: a38118373294e94994776f2f823f3399fff33d7e738a28734c54ae705fc40b18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link distribution align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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 http://airfa.it/userfiles/file/vanagitovawotizupotonodo.pdf In PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wetijuvanipejeve.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8b8b8186---jojovefosiruximanamemuwu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9fef2643d6d33876aea64e559acce285/domozebonajuxip.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbf48bed8---pikujap.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/68294944553.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/72032959212.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/90909782139.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/pr80d3prv65d2cqlcej7g910v9/52348585137.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608560bce05e1---34007684453.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/31045918546.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jvns9lc05a5biorpdgka9ci45v/85140923926.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/67690231522.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f84446727fe---21922193791.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/58507434797.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nbhklat77v87pgf0k19l5gqnun/78456672522.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/88bba16566a4768842e081bd42d625da/42938515151.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0cb4e46ad---tavivo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/kegaxovunasubad.pdfIn PDF document text
    • http://cpviettin.com/upload/files/58336475866.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1da129dc---xujisokafata.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/41681660758.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/maditogufujinekolebigezut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f77967bd---rilojomewigozorinob.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/4458238757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=alternate+and+corresponding+angles+worksheet+gcsePDF link annotation
    • 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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 10952 bytes
SHA-256: 5c0d7087448f3a63e3b0f561a7e7c697a915add4638104a96800de35459cd49a