Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfd0f874052d1db…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 01:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 452dde34dc3e0215fa9de49893d70f95 SHA-1: 8d084284d59cfa27da0d99a3caa78561b4e9bd1d SHA-256: 5bfd0f874052d1db857d2808b162ec53597a4b63508cd2fbd2a8e911394e2d5a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or potentially malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters further support a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

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://pistant.ru/uplcv?utm_term=one+upmanship+book+pdf PDF link annotation
    • http://dogalakustik.com/depo/sayfaresim/file/vunanapiwubuf.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/njl6c9lvp9nud6gmtj8a6fv9oa/49021279715.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607072205fded---60467290571.pdfIn PDF document text
    • https://service-panev.com/userfiles/xejiniwujokatet.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/6620051322.pdfIn PDF document text
    • http://ge-mak.com/files/renug.pdfIn PDF document text
    • https://strechybenesov.cz/content/vexusezutagugodepiga.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608196fa1017c---43328101962.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f65b2efe9---22896706791.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2r7m71erab0k2ofkbrgpuqajqa/dusenerukadi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wumidopufixupot.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/677cf5fbbeb4c7f94f9618d2b8628ffa/6220241819.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1cf8809a5b9fc284947a3be95c6ce1e5/fizufono.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2cdef89e---67551001760.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jozaluwewesaruzeritanuj.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/ramuganalelonefevif.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7737eca60---4555278257.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7e56cf576a850106fb6b701a58658b1a/7087277409.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/78346679417.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/91dcc585cc7c6e3f5029a9f49c9da9ae/11110735401.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/joxak.pdfIn PDF document text
    • http://amdind.com/userfiles/file/geverikakuzusiselijelof.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082af77ba927---kinovawirizapemepulaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b1c1702---57750172650.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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10876 bytes
SHA-256: b71ccff8395c64cc66546b7279e823d45f46d833279b6d35725203a7da1bd74e
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 18832 bytes
SHA-256: efbbbd2134866ad2d7b2b146c867e2124cd8639e9136d2a2a667081e3c2fec63