Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a2f9099a4835b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-10 10:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 458d7e99cf62dfb4656a82196877943d SHA-1: 2cba82f317d67c0154571422d5304e7f2542af15 SHA-256: cb9a2f9099a4835b7ebd2209ce4e8d48368631ce6896d4b2c42002e953001d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting. These URLs are likely part of a link farm designed to redirect users to malicious sites, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=the+perfume+by+patrick+suskind+pdf PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/55aa0f0227f98b51c3e67fbe08705659/paponuludujiva.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/so6ogpusd6vd1749b65ifopm3o/kaxijorebawuxidolugata.pdfIn PDF document text
    • http://net-marketing.hu/images/files/52483056704.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/99730649012.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wafazepu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e85546c78---67908393139.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087901c6f7db---55667175448.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bb666112ba31cc08321872a6337525e/rekimenotik.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/42415802368.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/37223268285.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/c4jc5l53sblkiip3hgc67k11ln/retoj.pdfIn PDF document text
    • http://apcmagon.com/userfiles/27454872377.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/jurijozejap.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/5061421154.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/tagiwal.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a07dfa49a03---nubajotidebabonumevon.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/35944367101.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e580885e03a5c45ecdd9405d9cd23cc8/13923608486.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f7cbef0fd858575f0c7df010b610dc3b/kuweteratafekeguzal.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/sgq84hboin2taqdv1uh9396ikm/94975075508.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eqnvujrlji36b753s8n47u7sr6/jeloko.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e72d6035b8dfe89b55da34e72cfb3e83/73002805187.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zopuf.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/793ef05b4614d43064eacbf0d8a224d9/28553369412.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/likanuluximejiteva.pdfIn PDF document text
    • 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_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 17184 bytes
SHA-256: f91505084bbeab5987b7ccacd8519ee2bc3bd72c681f7cc86c9cff8913e32506
font_01_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 11128 bytes
SHA-256: 77e04640cd71cdc74bc523dc5717e64a6fd219d00bdce7b8476764a23369eba6
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1