Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc62b18762a9ebc…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 18:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23efd0dfb1422c722d902d1a2a04a037 SHA-1: 386374f41093d9f6ddac86027d83b7bb2d153620 SHA-256: ecc62b18762a9ebc32553e8076757f1244284aff74aa2fb16295e561a23a068f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=qasida+burda+shareef+english+pdf PDF link annotation
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bfa2b4c805325c461d6e8d8708f0a0d6/82763980924.pdfIn PDF document text
    • http://xycrusher.com/d/files/29515316038.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefb76b38f---xapixenipasivavunaxuku.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/dodokesixokiwipuronagori.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/wuvirumiwugobanevifexenul.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d529e1938c---1513732932.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/11889959206.pdfIn PDF document text
    • https://advik.net/userfiles/file/53992611892.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b948354b2---84741680045.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f8719cd114c---2677086695.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dilitunolezarinilij.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/95843026daac6dff53b03d484c531ad2/tufurubumav.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/27081123905.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bizazin.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wulifujugakozupa.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/082389b506d1258c84786725b9f7f1df/xodupabazokoz.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c201303ac---dusodase.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429072429292119.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/10628961511.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/mawedawemixe.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/vepategupi.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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 10856 bytes
SHA-256: 7312f85068fa2c8f92ffe0c119f5e5c89c23e50130f1a5e748b25638f5f666d7
font_02_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 18148 bytes
SHA-256: e14a2f72a93ff2cdba83ecc171a465ccf626553ee2fca4a7302ce7b2323e492d

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