Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7493c2f7f9253c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 22:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b924f62ff216c1bc8e41055e991757d7 SHA-1: b36b2d13ece2f65b07b0b951bba880980bdb3443 SHA-256: 6b7493c2f7f9253cac596b3c80d0a187b5b0f0e4c44ba3ce8f2da24723372a5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it with high confidence. Numerous heuristics indicate it functions as a link farm, directing users to various domains, including compromised WordPress uploads and disposable hosting. The embedded URL 'https://irlanc.ru/uplcv?utm_term=outlook+login+in+mail' suggests a phishing lure related to Outlook login.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=outlook+login+in+mail PDF link annotation
    • https://cytokin.ca/upload/editor/file/91799279457.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210903_04BC215FE9FC247B.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • https://ratosatu.com/contents/files/90376982356.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/6239989811.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/fuxuzu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/galelemupogedo.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/14127159863.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8b4cd60fa8e75e66f3d810d98459a6b0/sefawamu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903132203.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/19975426635.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff7f3c346---felip.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/vowefixukezizut.pdfIn PDF document text
    • https://sitarasign.ir/data/file/2201043308.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/simifetiguwizi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vofamopif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7026889f6cb3b6829f083a09d7d76a5b/85517204782.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbda44d807---ridatanegapifuwefave.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/24137525517.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/kigiwazilusimija.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///13491251966.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/731fd659de44a85f8af7daa44572d94b/10041781401.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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 17868 bytes
SHA-256: 043f4ec05aea12d93dc8e372fc688ca6e45819918a41f166d39074c3b584fafe
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 10268 bytes
SHA-256: afe2580fba04291ce69e74617a068cc1456b5dc2e91d0fbe98c70ec6a63f5826