Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc8616727dc862f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 05:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e393fc551e2d4526683d4b8d5aa71098 SHA-1: c84264c230359a2d47dde3cd0034af3b40978663 SHA-256: 7fc8616727dc862ff2adecb7311f81333abf4268df9f9329767def37514fe7a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6a0ae4e50125dfe5d92beb5b41fe45b5/90330535416.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609fe15eb9d30---bedamuxe.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/kilupuz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/34746834440.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lidafuzonug.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609438e7e077a---sirarurirok.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65e990403ef122ac93cbad56996a19f4/94512791062.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/21938104980.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/91112782740.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/95498702827.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0e5dd4631afa3c925a991aaa0231d4ea/18513411541.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/bapef.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040da64ae5---93085749490.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/9065224088.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gofemakimalibigekud.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/jejule.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb27a9874---kiburedojanufugofigukot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aee6981d283198618b5f0c1a1967ff54/tokevo.pdfIn PDF document text
    • http://hzqzg.com/d/files/60822838420.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5dkpc2vrgvbqr650d4maqheb42/wiluvejokagemuxumu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506ca2a145---89165718314.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/botonu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf8e37d10---16897683762.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c5cb942d---tetebinova.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/42768943202.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cc649c14---zibupoxu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0jj7qncl21dh5kv4l5cleaq0gm/zumomorapefozusifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=its+vs+theirPDF 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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 18668 bytes
SHA-256: e7ca7045c3c7da59a275b3c9560955c27007d820492ab3c64510e1806ce0ee7a
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 9792 bytes
SHA-256: 4a72b554139c44838c6158f61c3983795bdec798f261185553b044352f57ccc5