Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecfcbe081a0c4b9…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 23:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b33237b23155c1dda4af23b6efcfda83 SHA-1: 5e9a043071a2f6cbb751dbcce9b3cc2f0ce6c82d SHA-256: cecfcbe081a0c4b9ef752fe4f86124a038a2fbb16f8045de727bb99178c5dcd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other domains. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71c82df7d---88809747509.pdf In PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewerubu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/wenivebejoted.pdfIn PDF document text
    • http://ubest.ru/images/file/dofexova.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/najogazivapox.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l8lveasi5dqefvt1k6f27f7082/2456204801.pdfIn PDF document text
    • http://labonscafe.com/userfiles/sesirekuloxikujofomasok.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/4686401519.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/792a62631ff794d814d93d9f66a8af32/mezide.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k750m4jgmclpdf2ofshm49d00q/lijamopepuvupamekukenep.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/42012233414.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/eqtri74fhu7kemeg3q7lqvq8h2/80841390715.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/170962960.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/91957165980.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe34098fb0---begulorarukuraboko.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608477eb6ae3c---nozolomugezabebizijekoge.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nowufakuxedibulaz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d657dbdc4---lutuzizojametikexiniguvu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9cb31312f---nefaruni.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a200c4c67b8---98102786189.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73266aa6d---99318501880.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/68654205362.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac83f993---84887212199.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/48528649589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=z+test+two+sample+meanPDF 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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 18040 bytes
SHA-256: 338d3155e3c5353bd1d3767b881da098308f6f393fd6c47187bd3f6da9f4bf14
font_02_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 10268 bytes
SHA-256: 61cb228bdfbfe7975924f6c944418fd30af32df0c02ea7cac3c373556ce40fad

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