Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f26908fe13c078…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 19:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c5bd2077e4242c1af6f6627ab6a1bed SHA-1: 61a86656bad359afa942ed2cdee177c8386828aa SHA-256: 67f26908fe13c078900a7903efbbe6db782742aae054c53c9cf7ec36fedd2743
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosting other PDF files. These embedded links are likely designed to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/031eee62d53fdf1d8129ef40b33afc7a/semazaxogurib.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/madijidetuzegil.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wixitoxiwenanajatagifomut.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f86b506bb---61224562420.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107a91a11c---xetaruvetef.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a04f0d5b5d049b485d63792412359b98/27028475598.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55234de66a---fezejilexazikivi.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1f594e3---73571716290.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/39230004956.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/65917825577.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f45t5bojlunldoa28tbapighsq/83288033058.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vudopux.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/81438813545.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/sijiwamewuseverewikunex.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2e146159ea301de747121b295ead1151/xewejegotexovegaja.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/xirubuzib.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/26318732408.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9506232495.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/lemavegafemabupoja.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/fulafekulegagibuketor.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/32415074046.pdfIn PDF document text
    • https://salonrewards.ca/images/file/duvalivisoxexovimufizurom.pdfIn PDF document text
    • http://spacio.hk/attachment/file/xedimopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=alexander+pope+odyssey+pdfPDF 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 20592 bytes
SHA-256: 8089030fb6c5530ce4ece846856f5c249199cc98e756b9e6b7667d48947471b5
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 10496 bytes
SHA-256: 6def926aaea5b876f70fd03f8daf6d11d0c2460b65bd3da1c15b421f8d15192c
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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