Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef1c5b56868400…

MALICIOUS

PDF

102.1 KB Created: 2021-08-21 12:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2090a1afed278fad2cb8fdfe9f301bed SHA-1: 33dc507f5596dd40de9c925704a8c7b415d0b05d SHA-256: d6ef1c5b5686840039a56f45f998d5967ad6a4e1bdfa77481f4cb24747e6bd3f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccb0f3ac74---mivik.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d054f59b72---71434035292.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jubaretupozupot.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/48884577949.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1iofsnhmqvk183iuc3bp1fsjt3/taranokizegubivofin.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6b60a949---23742862784.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0cbb9fdf---18312262388.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/48iltl4eh8m04pinn2i0hu4ek5/xisokiset.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/gorigivukofiwinoxutuxawo.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/patawotogewise.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/013848758ab93a372084dc81ba2ff001/letajugegefavusanonaga.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/58664193987.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/pisavufowovapomopetomut.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba734fa30---sivuligen.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f603bcf147196803f79426f84368c1cf/rixikozegelugiwizupafi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b9dcf6f5---92207237103.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/gnt1nsbifthbcphgkirhghprn8/majulalifezetamunu.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/buwoxavejamenuvagudibupu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/if0kg3h7m5d83rhsl4kqea2u5k/18554071314.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a43c04d9ff---91809351171.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbacaf145---77292809331.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/80616496536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sensibilidad+superficial+y+profunda+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_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 19964 bytes
SHA-256: 9483edb9a78bb00e56915d2b47bb35a22486933f2241bda6ad5e8b19d4e4dab0
font_01_sfnt_off0001565e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E75 10944 bytes
SHA-256: 72364d21c2202761a44efcb9bed5a406563af9f68ace986d7f52ae7913a10100

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