Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1bcbf72f4f9ec9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 02:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69c1dbee1ee44172be0be91b7ae1f5d7 SHA-1: f1bf505581d3dc43f136811bc7b45aeefef1a4e8 SHA-256: 2a1bcbf72f4f9ec983a4668643e202c397ed26f92f907145bff3acaed7c9591c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports that this document is designed to host a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=naruto+shippuden+ep+139 PDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/6686069848.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j9b3phugkh5v6s8bklacjna8i6/pavijofoxanuje.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/66388412895.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d1b9891e5---32061971482.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/futofote.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gozef.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/samubojaxuxo.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210911062446.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/17514679409.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/91748720004.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/rovunusabezoxegolasude.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/deginaporop.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/6169768574.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/degitozirofobinutofiv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d3dbddf1---zoralamuwazebomifaturo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8972bcc---sexelebarunirinuwuk.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mujuxixilofe.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109190559305606.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411d93c14dd---18952043358.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109172303567892.pdfIn PDF document text
    • http://skisun.it/userfiles/files/bigobudafivaxakepegora.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/34176695303.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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 18492 bytes
SHA-256: 102a9bd5686cd937377adab2ecd1634c70a55ac2aca1d173241cc7adf3c17808
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10912 bytes
SHA-256: ad40a003f7adcac81ba8c18d7e4a9f71ba1bfc073dd4fab5a34b2baefe786f34

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