Malicious PDF — malware analysis report

Static analysis result for SHA-256 947780e53b38834a…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 01:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1488046416ba755b4e9543bd9f74c558 SHA-1: fa5cec2bc21246c9643dd9526abeb84ac31cb134 SHA-256: 947780e53b38834ac7a4246edcd4d266ed8912fa7f7ee166c8a321cfde29c1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=addition+and+subtraction+of+fractions+class+7 PDF link annotation
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b563112eb1d---69614702497.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed0eceb32---52477592167.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbba58d1cab---5455720459.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/17020295900.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199640700222.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/hgrcegbplachtkfa58hal3kq1u/posixebedigexitevu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/8891210849.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/japeza.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f430bd48c89aad875862b3e0ce1b8e94/fupodowufo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b10bb4b24---kinevanewafafi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3dc394047f9675620da439c30d33fbac/49224060315.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf920476cf8---52472975712.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/be2617f00845bed50c2d4e420fc77b0c/63798224336.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609002b8a0d93---dusufaxuxifavatig.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/67830643239.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab6c01435---32433455189.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/sufamoxotevekebikedid.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/66908052119.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba291425b42---rirani.pdfIn PDF document text
    • http://distributoram.com/files/file/ledinelupavadekumalanawu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/koxudiwiziponumamak.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9a430c5d---38901431149.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/28ffe2d3659844ca09b1b7b3bfd45dd6/fojisodanirokivusubenev.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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16972 bytes
SHA-256: 45a47aec2499cc8a0fd8d49d00782e9b63ddba59543745341a2ea2e917dcfeb0
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 10608 bytes
SHA-256: 45e52c80631ee587fd7d0b7d41e61d62e6c0fded96bf124444dce50c4010cb2f

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