Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb69b7f9b7b43828…

MALICIOUS

PDF

90.8 KB Created: 2021-07-23 15:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b7c59bcada186b82cd6b248ef075e3 SHA-1: 4de3bae9464e15349cc5d813cdfc46bb7c5a3b09 SHA-256: cb69b7f9b7b43828d81e75938e50340c9124ef0f977d330a64bf9dbe4d19139f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised or disposable domains, a common tactic for SEO poisoning and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coinmarketsuite.com/ckfinder/userfiles/files/79421013421.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2802bbbe---navobonituvezowibu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u899dn8d34nd0ulqntn4nomo9h/taruvejetewizikekegizobe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a411134a5bb---rifiriwumejinef.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be52f4ace80---84091030485.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/8831861548.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/73ace5359cdeb1ac3fcb30ffe8f44e6c/6513985873.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2014cd62d---nilumuvomagiroxuj.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/66feeee4dcd3998617c34ebee09deda9/25944423696.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/34261479384.pdfIn PDF document text
    • https://anjingliar.com/contents//files/bokevi.pdfIn PDF document text
    • http://enricobarraco.com/files/2334829887.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/79297196355.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/35155370957.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/dawilosisinodo.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nikosadurubi.pdfIn PDF document text
    • http://cloverdiamond.com/file/73475019020.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/vosofibigexebavo.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/vunelejuvagupine.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d42c9c6ab1b---71626656207.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/xigipozowanijosawalo.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/68644654070.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/17838060958.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e748d255ca67b3a01b9fcd8af2202cd9/11276826161.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/22nk7rjs6ajr49u658jprkrp6t/30042256851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+connect+my+blackweb+bluetooth+audio+receiverPDF 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_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 17576 bytes
SHA-256: d1c9d72761630f832026c0886ebb580222baca7db1232b52fa74c5d6b4ab424f
font_02_sfnt_off0001430b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 11056 bytes
SHA-256: d63e8d65aab53088966f4b2bc603d8e1b3c7241b6b2d6abf3398e5262e9d3eba