Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b4f9de69218bea…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 23:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e39e1468c78ff4927d29a492e23605e SHA-1: 5f10a8f2816bd5a2677e8e0d152927848c5555ad SHA-256: b0b4f9de69218beac72ea8d3a365988f96fcde10f5107153c0dc27ba72bc1cbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/wofoduluguselufiwurebo.pdf In PDF document text
    • http://dblbtech.com/userfiles/file/bomineliwawafuxux.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/gosurunataxetikokav.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/fuxid.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4oh7kiqonrm7ovuug7ki8i4pnk/risobenujopisiropu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/15141379492.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/86174401878.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/87014394113.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa3a741cd---nikej.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/56113220149.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/67084942677.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/jonivojikuwasudam.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pujawexe.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/xixekufa.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/26800950754.pdfIn PDF document text
    • https://kratky.eu/files/file/tojelanimewuxaxapamidem.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tazunosirowekiperudevapo.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74942524344.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/98146104728.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4b98eb6d---bazon.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/61533084707.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/menere.pdfIn PDF document text
    • http://tochuchoinghi.org/files/vitewedopefotafisemomivu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/72226569683.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/vokazemimobetodudizajosul.pdfIn PDF document text
    • https://kaparatt.com/images/File/62456529224.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/10318666522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=friends+watch+with+english+subtitles+season+1PDF 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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 15120 bytes
SHA-256: 327cd1fca4d80e3b5ced25a444e4eb243446700a20fc6e8d4830070abbf7450e
font_02_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 11004 bytes
SHA-256: 0408991f5ed422ce010c2ef8cefca88ec49d97ee0af4d64b1dc578e006019754