Malicious PDF — malware analysis report

Static analysis result for SHA-256 390b14fbc67018cc…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 02:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbc0b1892b0a50c2548eee6bdd4cfab2 SHA-1: 60db61c18b557952120ea1c66411a2bbd7a3ef5e SHA-256: 390b14fbc67018cc1fb699e8e4a4295a02cfc9e1d6c7d21e00f40c4eee133ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is intentionally structured as a link farm to obscure its true purpose and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://krisoc.ru/uplcv?utm_term=scan+wan+ip+for+open+ports PDF link annotation
    • https://stopserv.ru/files/file/50807244897.pdfIn PDF document text
    • https://superpart.com/files/xojunidisijenikovima.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/49140637781.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85f32d8f3---42616347019.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e156d9625---zotofafowawakesaxodepu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fkceggiogj0o0cir68dv3e0aem/bupirowubuderojejiwebi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/sigomisixak.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3ee52bc917f8a515b1b367a8e70057d1/nimukegenupovufow.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kamoguse.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/55663764617.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/u5h41j8cr602u45g7g4bp2rk8e/mubeleritovumufexe.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/35756188000.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87e06eead---tivujik.pdfIn PDF document text
    • https://protrialse.eu/files/files/gosafimegevoladutujan.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607471cb67f20---40922046917.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/pokikabosifutenapid.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/jodabote.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13819ca4---59258138526.pdfIn PDF document text
    • http://jarosi.hu/files/file/58847464586.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/1572718216.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/waselakijupiwelodilinobe.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/74849035767.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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10588 bytes
SHA-256: eb8c66828b5f06cb23e5ef125263927f70d47f553de911473d388db2afbc41b6
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 3592 bytes
SHA-256: ba30738a961a6defea7120ae32b8f809534a21bf6d96070c5104ea6f9cd33032
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 17524 bytes
SHA-256: 93c25e67017a97f21973f250bacd921d810e8d241124395bdecddde96c9af20f

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