Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38a4e42c9fa4e9b…

MALICIOUS

PDF

283.5 KB Created: 2021-08-09 19:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b0fb2a4f9c4e22370ca639eb1eb1419 SHA-1: e95f19de9cce5f6bbb60bc7d0db9675c23dc9cd5 SHA-256: f38a4e42c9fa4e9ba2a6251375593fd149f66f31dafced72cb0aa62ebc8ddd88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, potentially a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=administrative+law+in+nigeria+noun+pdf PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n7c6eaijns7v3ua1i7sovblshj/danuwixofogevibogu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723a5f77c20---xamurapimafojawonoletemiv.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14174540864.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/79075783146.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5e8724ac---miselu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b8f47f684---34936624644.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d60c7a0e8---26196813370.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3a05fef2c0b7c92d2346d490db112e0b/4546078103.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/66949902738.pdfIn PDF document text
    • https://udruga-invalida.hr/files/56217628694.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210526011050.pdfIn PDF document text
    • https://vestol.bg/files/file/65722273120.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523023953733864.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gte02olo51cgq39n7qrpqo5hbs/kasifovorofipebe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160781f7e98081---68658482961.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/bifekimur.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a743cdf63---22227653424.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe5136dcc8---19239786527.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/q4ng6k3oos4qc916n4pnptcso4/kidanam.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4701984a5ceadc088df2f04bd6e65990/18777680920.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/71021220405.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/59789987087.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/zilituko.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/vizanotuvuguduvimujitera.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E3FB 11076 bytes
SHA-256: f793c3102612f0b9859a13aeaebff4a270130709f08a7a28e87ffc8bcc92816c
font_02_sfnt_off0003fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FD9D 25344 bytes
SHA-256: 6ca324b363b1b9c65c4cba7f6ff676d617d0d38c529a4ad98152472ad0de33d6
font_03_sfnt_off00043a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A65 11564 bytes
SHA-256: 1d27c387c1d3faedb04286bca39908f2176b29db0c50e89510b8cf1f3e4549b0

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