Malicious PDF — malware analysis report

Static analysis result for SHA-256 f460e9ff106e3662…

MALICIOUS

PDF

81.0 KB Created: 2021-10-07 13:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c90e6dcd922f85df4a83d6a33cffd02 SHA-1: 16f42311152c9bdd466b2e17b91226352ee3a9af SHA-256: f460e9ff106e36623c6f34d1735561b512af8d8c771f1ff03f2cd42eeade2544
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites and disposable hosting. This pattern is commonly used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://jeanmarcrobion.fr/userfiles/file/jenibonimonifekesugi.pdf In PDF document text
    • https://interstudy.net/userfiles/file/59397793607.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/wijov.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/92205560603.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/98631346534.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5b72153bc35008b703070dc402b62544/dikimanijijemivupidir.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153632370ed3---82050395294.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/69330265905.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/34745065660.pdfIn PDF document text
    • https://wlweb.co/sites/default/userfiles/file/jojexisisekixa.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nolovibezet.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sapozozuxitisomifuto.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/56608647541.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/zitipetalixijurit.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/kewomepube.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/pujeful.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/wimufubugumunutevaj.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/16152531162.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dagaguluvedomixu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac7efa9c---gaxemivipireju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+to+force+stop+appsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 10212 bytes
SHA-256: 55538c25db82871e091f009eb2a2cbce8ffded2867c785a9b97521ecbee6c4f7
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 18588 bytes
SHA-256: d79f90fb411779ae288a9bd139a15a5d48ee1ec947c6cf218e38a04ab0f26c25
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1