Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0cc38e221e7e8c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 09:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43f556edea67232371f8b8ebdaa55e61 SHA-1: 92238e7e7d7d0fb3b2acd9836c902ff23dcef5b0 SHA-256: df0cc38e221e7e8c8c3f8cc77c5905b038d0a2f96183e69a1b56ff63ab3b81ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination or leverage existing compromises. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=bachelor+in+paradise+season+4+episode+1 PDF link annotation
    • https://tumujerrusa.com/userfiles/23821656946.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/zowikobifajimiluba.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/92985952383.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/47311753083.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/47703727286.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/dopov.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/4109784664.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccad4d0a42---84885942893.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/wuwugarazuxiviwez.pdfIn PDF document text
    • http://underbutter.cz/download/foto/32523042371.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1e9a8f77e173e12863f739dd51a849f/nujazirogevokuvuporinemef.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9a7d476c1b336177859570f731285cfc/guzimirepumoninivatopan.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/xiwevarufawat.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/xikugesak.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/serawilepufumux.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/62153015182.pdfIn PDF document text
    • http://sbairs.com/datas/files/54026287512.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/29830808639.pdfIn PDF document text
    • https://olterus.org/contents/files/7117254655.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/jeduxigibowo.pdfIn PDF document text
    • http://metall-press.ru/files/bisakudawufuwizit.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/61806809430.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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 17736 bytes
SHA-256: efa533a2a2c6da708a7074e250b0af8fc4b25382b673f28bb171ccaca50da673
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10696 bytes
SHA-256: eff5e0128a1d5b927ff1a13de1c38de18ffd0a137501aca4a617cbf6c25183e5
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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