Malicious PDF — malware analysis report

Static analysis result for SHA-256 58785213aa2bda68…

MALICIOUS

PDF

105.9 KB Created: 2021-09-08 11:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 811b492fad6f4d6d587cbf0aa7e04b68 SHA-1: 474f335e07c7eb11f304971b79c03dca7a451bf8 SHA-256: 58785213aa2bda68c0b5e89ba481acf76a55ebe85a8fa534a4c46e399720ef36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=capitalisme+industriel+pdf PDF link annotation
    • http://newbusan.net/FileData/ckfinder/files/20210721_616F654507CD97F2.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2effb26567fc0d41078f5b66735e7c18/zekew.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/7572739362.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/14719311ce5efb2c3e294b1066660f36/59885729659.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd72ad7ef3---79304597858.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gebibowewemun.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/44007294475.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/69478938913.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a785c8098---bojupazovimabavigusopox.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2850d19d53---43224376743.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3cf65df5---795368783.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082694c9078b---24342512290.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/temawenusomibogogavim.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83cca10077---tupasiros.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1fbba2e5---dikagobilimixa.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/9276776055.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/38032468017.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sosariv.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jodowid.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/kuwerimirixisewidadarefal.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3fd90633a61872e38bac26c7ec3b73dd/34354625971.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/dagewajuxogunasoresi.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210519120307524198o5baio.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/28153332789.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 10672 bytes
SHA-256: 2a8aeb6d680f01739656fbb905c019aaaa0bec3720bb83548b788086df7e9589
font_01_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 16448 bytes
SHA-256: 9c7d122f45055eaa9da4f175e212d5f3ef963b1c76a3d233a00c1ece138e5b70
font_03_sfnt_off00015c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 23688 bytes
SHA-256: 49f1a1828dc7e63ec36553d37cd57c0addf82a881cd0a2687708f8acf2f820a5

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