Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b86713b667dc63…

MALICIOUS

PDF

77.7 KB Created: 2021-10-06 16:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f613e67999702295c4280f8214c2561c SHA-1: a6baa628ba21ae595c6b7e6f74e423be1b6a01ff SHA-256: a2b86713b667dc63b8c8df0028e84febd8a2961d355bca96fd515490e9ba1e5e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxedopumedokubulevatafe.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mndb9gmvsnspe22a24qqnhl0b6/pogezuwatulasoxil.pdfIn PDF document text
    • http://didopack.com/files/sovetal.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109150418094333.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/7540119878.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/33052510020.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/tusivaxe.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/powezelemupubalovejozos.pdfIn PDF document text
    • http://chongros.com/userData/board/file/popolepazumilamezikozakoj.pdfIn PDF document text
    • http://ifap.it/images/file/vanosixuwuxaributusod.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2208bb6f6a6aa096052ee21912b935a3/vasoxovukuwarefu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://sententtech.com/file_media/file_image/file/36588557017.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/75930894227.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0c59a290b65fb2e22d01db1e40cccab2/26610458155.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/65343320272.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/28662421731.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/61f9d3671a810c96d0c6c75d2cb016b7/15336653027.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/siputunotesuj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159d09fd379e---zomitafisumavabegu.pdfIn PDF document text
    • http://rideco.hu/upload/file/52884264330.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/52444891126.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/liguvorinatikiruriwutino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=candied+yams+on+stovePDF 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_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 10476 bytes
SHA-256: 5b357cc3c82c2864760eab4206eaa919f373d1bc90354e9d624f0fd92c1ababa
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 18300 bytes
SHA-256: 7c00f21a8fcfcd04a1e9586aa2b41a39ff699a0075c769cbf0973e85a1d501de

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