Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e97187d35938c8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 08:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8d072730271401e477b3e63eb8695f6 SHA-1: b3ff043377e5861061e5265cfa66d4856ceda8aa SHA-256: c8e97187d35938c8e9227d0e44f347d9c254639d714c360b7bc4b0daaa6b9441
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing by redirecting users through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=aakash+chemistry+study+material+pdf PDF link annotation
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/58640601625.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/dogojuvanog.pdfIn PDF document text
    • http://orem.mn/uploads/files/37111005691.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/65603892099.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/jazeza.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/giwiwulenebosapar.pdfIn PDF document text
    • http://air-ned.com/uploads/files/ligipilo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/32424245107.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vopusu.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/wirigajutusasunagejemul.pdfIn PDF document text
    • http://planetamama.ru/files/file/gedaxuzijataj.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52d873f87---11185004847.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/puzuwebitirowava.pdfIn PDF document text
    • https://bataretak.com/img/files/file/texixenazejorupakikamog.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/inudl58t4b1mhilprp2loc26rq/bepijonaretinajolupafote.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/44655712144.pdfIn PDF document text
    • http://vinmexindia.com/uploads/52434177970.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126bc6cf2bbe---lomasuteribebuve.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098715a63bad---54268467950.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c872b90a18a---zapinokisufatexufo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db4d586f9---91857741722.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7c0bbe55---tuviwugozinebedovefalitos.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077638ea9466---48900066507.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/17431231442.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 18364 bytes
SHA-256: 75565676a25f4a7d4daeee963f571ee24f047d7b4ac66c2f1e2bdd62dc650284
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10948 bytes
SHA-256: d60c05becfcabf317828c676e6a021087ce9dc68f941238c3cb988fc40f69699

Open this report in the interactive analyzer, or submit your own file for analysis.