Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c431152e06a67e6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 17:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1dc6d01cfea11db60fd520a3408cb8b SHA-1: 4fd7f34c23daba8e990b6e88f3c9a82c203ba04d SHA-256: 2c431152e06a67e6f42e1f377db2d283d65bf0b91e7b229dff9ef232df17c988
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bimstudioinc.com/media/files/sifetevurujakujifilodete.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15291c1---55186264914.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/dukesezetanu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/20198054031.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/80190653468.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vovomev.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wosejasimokatan.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/79438849569.pdfIn PDF document text
    • http://kccmaul.com/files/files/33277815090.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/5874155910.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mejov.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mebarizuvowadubuz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/34786659713.pdfIn PDF document text
    • http://cocoal.com/uploads/file/80533858849.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/10084481813.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/jenijukunibi.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210831221227.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c318a17c---bopuwitisawat.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/lozovuvupevakigi.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nibiberigegelakitajujidal.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zewulomovukuzu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de96b28de1---favedo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tominewiguge.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zaromipapi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161379a25836f5---kujelid.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d5f2e0d0cf45c8283d4442efae0a0f56/nejujimogasige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=impersonal+passive+voice+exercises+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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 19176 bytes
SHA-256: aad649f5b4a0e5ef6b8402c60cd1386ef470c39f72bdbdc803812d39d9dd88ef
font_02_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 10804 bytes
SHA-256: db59dbd3a9f09b34fd1cddc97d95af221c485e6264b724b69008d628aabd9243

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