Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ba447b7e1ae359…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 14:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 92d78ac94f7a2f14b05ede3bac47491a SHA-1: 9045f8a34ed0943a2dd005e405156204eb52d62d SHA-256: b5ba447b7e1ae359ebadf75db00dda4a67eb32aacb82186a797de73d9a944434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to evade detection by distributing links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rybczewice.pl/userfiles/file/nuvopibegobe.pdf In PDF document text
    • http://harmonie-avion.fr/actualite/files/95586622157.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/4083789912.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297f9b6bae---xomidewakegaro.pdfIn PDF document text
    • https://olterus.com/contents//files/6844299967.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/64708648408.pdfIn PDF document text
    • http://iwishop.hu/file/54161301349.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kedukezirajobilovusixafi.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/45404972624.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/pifupafoxumigewosebid.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/xudarodife.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/31475936917.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b47248e9e83---zawep.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f3f8e83c8e62fc3f9a3f9e8d7268fd1/napexivapadebo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe77df3c---45014680874.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/89402505050.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/87242037205.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/wepokotuz.pdfIn PDF document text
    • http://health-bridge.in/upload/file/nufupazenipu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7d45ba3---titawaru.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b36a6a86---laxalomipukibidono.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ff8228e95254cdfaca7131b23d2b2f3b/ganon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a29beae54.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fraction+number+line+worksheet+activitiesPDF 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10956 bytes
SHA-256: ccf604fe59b751c59bd5ec103aa25954dcb08fee855850a6d87865afd39787cf
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 17012 bytes
SHA-256: 7ba10e2b1b68863dab5e7ce963f6f8a194692fcefd121f6abb861a057690a487

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