Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3de99437005485…

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e50fcb80f5a3691f5423a2a544649857 SHA-1: 5e32bba8b72b2933bf7ec30f9d07d61ac4872adf SHA-256: ce3de99437005485b1a0a1f2b3a827b2588cb7846bb69b1a413972c6e9cb57c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites using vulnerable plugins for file uploads. These links likely serve as a distribution mechanism for phishing content or further malware. The document body is unreadable, but the heuristics strongly indicate a link farm designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=brunnstrom+6+stages+of+recovery PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ba84897f57e520841d9a9b21539bc63/84558633783.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/38724610960c8d1ac9c566.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160da69cecab79---84366092783.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca04e142e---satasifisejiwolikaveti.pdfIn PDF document text
    • http://4bx.pl/public/file/33573073823.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8jlhka9fvhgd73ouua8r0cedqu/26937266949.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/12416237358.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cf4e298f---55587439445.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610826a85d5d8---lesesewapetevivupo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7f2071e17f0373cad4c9614dbb3ecc6d/daronetalop.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c7f11f5ed---vasokuxozirodute.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/47522521617.pdfIn PDF document text
    • https://aokman-drive.com/d/files/55077859609.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816bfa7d3be---89648452889.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/35463643130.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/db83c4020b9fe0fe1212faf8b04f57a6/tajol.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/14433919790.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/uafv94ldrlqi23d3n7151q4h63/roxojituriw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fn98js5tergug1n6gpcplcgijm/ninebamesexixelabijowuke.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/80622623126.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/350bcf41c2185973468ea1871460cd0e/bufamidogubem.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/pakinin.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6d888bd4---32964677332.pdfIn PDF document text
    • 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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 11044 bytes
SHA-256: 9ed1ef8df3c560329de62fcf4aa4386830a1d6ebcfb094d0d403ecc1e7711992
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 16836 bytes
SHA-256: 259a05cd20fd25e930268e634230da97bfe4289ae46c7c7ce95d43b25e084f00

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