Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64b6393e22541d…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 16:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1be3c9957d3d0a527ee143d416b97a02 SHA-1: dcc8e1d2f9aa02586608bea1fe6d731cf46ce5bc SHA-256: fc64b6393e22541d974b58e8043c7564146d636eca17e98b75b640c69e182552
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to funnel users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://broadmoor79.com/clients/864886/File/41938647242.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/32ddeaa6071c4bf7f089b5be3f343b9a/22728567724.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c46c8cb39---17225655678.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e7bc65ec0eda7cc9ee0dd6309dacef09/tenoxawi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/45151b4342145e0db77eaf0a0b261ae0/fumem.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b2aa6891---89569169221.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0595bb2ddc---88020301909.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080771820918---mejolaveku.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/figugovirirezokuxiweba.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607298601e0e7---10548397900.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3aaadbb334b678afb4299fcbc27deeee/noxugafezarajidasafipites.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609a388bbe474---sirimufe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/887d434f9c7361decf021f237ae5cfb2/2055321955.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f83283dc---xemodibakutusobonof.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3fcde607---jidibive.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/5875306593.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/movesapo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/37796949008.pdfIn PDF document text
    • https://iohrp.org/f_files/files/8237483863.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xakibirotajogukos.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3086ab7f---timujuxi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a0763ffb---96706823900.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/nugupibuvezu.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/66717598305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=luis+fonsi+despacito+ft+daddy+yankee+flute+instrumental+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 11304 bytes
SHA-256: cc338680e4457cdbcb7e3b44a818a3450531542e0ed985252ba05e59d9f67be6
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18396 bytes
SHA-256: 1b436896126623addacf8c15316572cad9acbb2b8698b0fcaee0b4d4e2c1b55a
font_02_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472