Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4586f731dde020…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 05:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 897170ffc52e772ee678086c55ec9969 SHA-1: 1180a199e214d861ab8064df1df31efcf0691e3e SHA-256: cb4586f731dde020cd564b8510824ff35a6b4ec94f206fc5e5a46997f9101540
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://alnoorcity.com/userfiles/file/sipuxevekosowakinadirid.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/234a3a915497163ead1d201986d96b1d/57849571561.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/tirawimuganubujabo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204586280832.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xasalu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/83464925191.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/jorin.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/754f559daa13e50509194bdb16e9f87d/janozesidixovuwin.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/is6ud2taodg97kkkdtn4h7lbee/25223688541.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d05cf669ddad17117c49faa9cb783bd1/dufidiletaresuwoxovuso.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9c8b764db6e3d76f8bb4da13955b0591/28344316365.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076265c0b32e---15981496447.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210618171142.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gopub.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2016aa2600---87267605559.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c2cbb2da29636dda65607a03627e95f3/2625597073.pdfIn PDF document text
    • https://avenue102.com/uploads/file/noweri.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/nelefadipaxiz.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdffd8dc4---75616129324.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nasolugiposisuj.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210524093356.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/750715fbc68e62b2976fcc74bd71e34d/vufunevezatalesigike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=body+champ+inversion+table+instruction+manualPDF 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16764 bytes
SHA-256: 515bc34a18ab5ade3fe121335c60952d92efb92acde97f8a70b74690063b77d1
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 11252 bytes
SHA-256: f2ea8b2b8a652400b925e5668daff818184c2174ecd49143b55a6756c5bb07b9
font_02_sfnt_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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