Malicious PDF — malware analysis report

Static analysis result for SHA-256 2924aa8a9a8476b8…

MALICIOUS

PDF

81.3 KB Created: 2021-07-18 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d531d1c89ced59f65005d6aa2178b1c3 SHA-1: 38dba2adbac0123464852a9a767d47398e9fe6b6 SHA-256: 2924aa8a9a8476b87f46a3e9e41748ef04072ea6fd6977a2b1a8538cd95b130a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ixtvs.de/_upload_bilder/_filemanager/file/41342303407.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/asgpk06567pru8ig8kbkl4arq0/60479172633.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/tijumemijitidenew.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fajirano.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b63b528f2---97931471847.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/reziliwudumamibigatof.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/61788f08ed5034e75c74e0717cf260f4/jajimipopor.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b82d74b12d83a54fa0a695e68567d14/72773772477.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210702043049.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/pexasaf.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0214beb5c2a49f324afc95d5accf215d/nopen.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/takogagu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/88caac883779dc758d12914024f33948/89950319668.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/xixalipawavireledinetu.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/xamizogomalekikikovaxojuj.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/momirivipirajusebepuje.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/50231913759.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a47dcac6---nedekosevowenidavilavabiv.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/totitikuvosanimetelo.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/waweriniw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781b43f3d73---vuvujukugi.pdfIn PDF document text
    • https://fallsplat.se/file/negejuzuvevesagifizaf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f1727d2d3d---nisezowovajiru.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2dafa3b79---4475496631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=poem+of+jack+and+jillPDF 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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16772 bytes
SHA-256: 9f307ecc0451500e9cd52b35b642528ce4fdecac1adfbd01b07fc965731e243b
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 10492 bytes
SHA-256: 153d192cba68c659dced4f967b328bdfbbd104141284465f68fa8cde3abe8ab4