Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dac45a85958e95…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 14:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c5f64278a5463a6de9c872e03b37112 SHA-1: 995845d324c9ab70a1bd272dbca4c8715c70363a SHA-256: 78dac45a85958e957e30d72e94f43edbfe8ccbbf0378751acf62ad6d93e146f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating an attempt to host and distribute further malicious content. 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 to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/69612fa8a87a738c3010aa2be6622f68/xabazitudi.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc09a8aa592---5801910685.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zurawabez.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngs358ti71v9gmfscqsf31fudh/puxavajurinozuseliwa.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12304332320.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/walamofidabanelugew.pdfIn PDF document text
    • https://cargobull.cz/res/file/32232580700.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/fimipugawowajevemavelo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67c0c81ad---85174153714.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gafup.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc26422e4b7a7a820d7590769d4290c5/70195431735.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/32418112810.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0ab94270---pipuvitepoxa.pdfIn PDF document text
    • http://hasyo.net/files/file/364015967.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/56815212203.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pugofali.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nobazojiteje.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/tii3iv1bqf06vjvatni3644ff8/1799434014.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/58aa1b763868e2c1f35ee1eacef6241c/tarobe.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11379326694.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/13294262903.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/88033982023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=certificate+of+employment+pdfPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 10756 bytes
SHA-256: 3342b1848b7cba2910e70be18e3d78118bad54cb21e912b5fe5a797da5f6d93e
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16732 bytes
SHA-256: 70483ccfc5c7717b1b93aac3b4d4cf220ee41575be71e7355ff56d5916479a2a
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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