Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40c2675f6b29c03…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 03:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fdb3f04f93bd6fd4bf8c3567f715058 SHA-1: 6f5f929036a23746259b5842cf185c17dc5a05b2 SHA-256: f40c2675f6b29c03d1bd66d6726003ca19f1dbe4f0e00c39678c3de11633ec36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=white+christmas+pdf+free PDF link annotation
    • http://ktcyy.com/ckfinder/userfiles/files/90526661081.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pdmccf8i3nvd8qtp5hpadmj3s6/24620827106.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b7b0bc54---dipaperasurujuwenifusira.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eiqshb9h77af2qejnal09l9srl/kelabojerulad.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/i78pc7c3sfhgnet02t3sc8maal/8085360049.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d60127ed---14119389063.pdfIn PDF document text
    • https://masihpt1.com/contents//files/buboxivuwo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/943e2e1d6ed7952d2c7e23512c2b3534/8806594699.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d249daeb7b7---zaxanipuzifolobufe.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/11038531613.pdfIn PDF document text
    • http://ibb-online.ru/f/file/92081098058.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/95159007752.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9492c3561---kagatulosizasolafupan.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/327582634.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/xedoroz.pdfIn PDF document text
    • http://iviltra.lt/images/files/wepebogozusitugunuregujek.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/aa6b0aee5773aaf6533ab636126c7296/53910968925.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a43141d69ee5b06af946c617633dc0a2/87559573041.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c64d50ebc5526d51406461ed42de87d4/kevojewozutosuxoxodezule.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_B1B5299BD52AFEEE.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bejanunufurigu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/pimipe.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/51507641818.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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 10608 bytes
SHA-256: 3e8d264dbe821b539eef96b6a9c54df75e8b46f884271f4278fda61fefdc728a
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 19580 bytes
SHA-256: 8804e1fa35ec46ca08d65a79f5607bf7a27bd23585fdef00a8a91ee7a944d135
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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