Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c437c3dc729f061…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 19:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc5062616d2668de29062f54801d970c SHA-1: f0b091ddcd47544dbc5d4c2e8b084a2f7783af8c SHA-256: 8c437c3dc729f061d9b153f753f30e50161723358aa68f190706bdfe5226ef4d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and a link farm pattern strongly indicates an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://villa-carlshorst.de/sites/default/files/file/61904171139.pdf In PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/84632091593.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xikugaporiwavenerorog.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/banumovetokusatadajudiw.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/eda7d52240ba4acf7472e895d13ad835/57056079389.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/45869651984.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/bupokazosusezitulefidubu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8f6cf7ce---zawewoladuforilut.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/75599608536.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gejazomewadobugox.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/84147520325.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/9449636400.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/34317195914.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16114cfbb78d84---2486647584.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7d39f554---79173596219.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/genuvobexuxegasidovi.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/95752349524.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210620040939_mkffwn.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161255248debd5---rukobamozazituzoza.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/fa57475c8d5879eee2569478d7f1e034/sazitosowofira.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608099870d1ab---fovigo.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/46976605294.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b036b6021e---jupiwagapumexefan.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4rjrvv04qirl70m834m5o7trkh/76057711609.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e57b0cb0---jofovununew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cad+2018+convert+pdf+to+dwgPDF 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_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 11176 bytes
SHA-256: 4ba5b2c7389b90ced348cec1bb7276518d36bd10017108e18920bbb8ad2bf59b
font_01_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 19964 bytes
SHA-256: 465fc4e27eacf9a93d0099c1c98a0736fad9d33eedac462a95062513a3804038

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