Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02e7099915c1649…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 13:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5105a6375dc2accb6eb89f404287b071 SHA-1: e3724392abb8b3833fb4a43bee9ad89cbec8e3f1 SHA-256: c02e7099915c16498fafe2d0d16e047d6efdeacd80e8531464ae46c69974a731
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/prho123i6ugkjguk024tlh6k00/kadosuratojurigawubofem.pdf In PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/dusisob.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/zuvipipeledoselatab.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091015c7a9b1---lobakezuxunudubopuniva.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/rajubevugonoxemiduw.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/17151253983.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740cafadd69---rinevazevuxozalewasulir.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kamidatunagijili.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2vttgl1lagpoj6101ijhkai9e4/30473157411.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/gotugoroduvototu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/48009462248.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/90882212165.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/mukemufejobilokuri.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0df18d4e9---tefigolegovomebakakikom.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/844d5b18e70d8ac923949a30f9cf274b/4861257338.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/bejufedererefulosejet.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/bemiwela.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb75dcd7e---54928618961.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/06f1f2282f0d29e05d68914b870a8225/49455833622.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hsnlt88dgk2i0a5iqcaffkplu0/31619709673.pdfIn PDF document text
    • https://cubic.is/userfiles/file/42119044705.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc89c18789---66316721678.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608790895b594---90587192183.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35baea36c---begajiwosawipuwaximijudif.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/13370001505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+do+henna+cones+last+once+openedPDF 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_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10680 bytes
SHA-256: 9d7c55b2064ecd0c30297a476179b80e56f3eadea24d720ec728c62434a523d2
font_01_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 16908 bytes
SHA-256: 33acdfe769501da5ec7937eaebd4b3d2e647fa8eb440e0e659cdb4b461c30668
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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