Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7df74a1e7b2d6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 03:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a1e6ba0dbaa47aa3e812d800192bde4 SHA-1: 349719130e849b1536d6039870582c96cbbbb3bf SHA-256: 95f7df74a1e7b2d66f647899d73e9efeff866dd8427f7572ddf68a38948220c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan', and an ML classifier indicating a high probability of maliciousness. The file contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or link-farming campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4a81c36f---71781460249.pdf In PDF document text
    • http://melabo.com/upload/files/48279717138.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/24992559149.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/88735284071.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429c230b5b6---rowibunojuviwaxula.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161353f2b640eb---juxedizabolipipuresesax.pdfIn PDF document text
    • https://matratva.in/userfiles/file/kosoxewizogu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/84646821780.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/pudojefufujinal.pdfIn PDF document text
    • http://edeins.com/userfiles/file/38770058205.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/66503400845.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21769107209.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/46326309039.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/179d2b07c6c008f8eb96448aba4c5de3/78152290479.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/91349687369.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/tafukam.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dee2a2fc56d9388dd442313f98ba0803/foxudopetadejenod.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/39563782412.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/56426066426.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/girotonedimi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/fapavulususik.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gojeno.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/43421588767.pdfIn PDF document text
    • https://baptistfriends.org/media/98962077133.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/85278008466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+for+free+in+mobilePDF 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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 10452 bytes
SHA-256: f5c6ce5187aa2ae3dedc538a0155b3c97a4ae1326f44f9e1d558c07848ef5fa5
font_02_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 17388 bytes
SHA-256: b19086cf14a26b92d42758128ea974b3060e2000e4b070a68daa4f840f6ffd5c

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