Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06455bcd9eae85d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 13:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8aebb8490046ead14165d1fa40b703b SHA-1: 2c511c10612c6b17d7389141f5984628fca7097c SHA-256: e06455bcd9eae85d2c97fa035bb326002890b58e4d822abaff25b29962c4dc45
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://i-akparat.kz/ckfinder/userfiles/files/dikudisobitizarorafotenol.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/506ab19fc05db5f7ad79aadb13e13653/xubexexo.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/44081483809.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/93535855024.pdfIn PDF document text
    • https://agros.net/uploads/file/mejogepolufazefe.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109161636284147.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce75bc3a4---39900263115.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/34121112089.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/10054952720.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92ba47f94---80611838262.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/55062730509.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db90c2db7---17148925250.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/pumiwijulunu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/21964478555.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161474f4011727---51707662250.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wupuzakuxat.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/gidupifesizufatefaguw.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0564907d8---53369015257.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/patiwe.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/gatovabixatokilax.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/potufutuvux.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jorigibazelimob.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/ninoxelajuteduboxamofez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=consecuencias+de+decir+te+quiero+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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10844 bytes
SHA-256: 4135d920aaa8b38e64595cbe00ef4533ddcf6717c32c50a01d1c9c1a0b9090e3
font_01_sfnt_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 14316 bytes
SHA-256: 953b43b8064a92d0a7e2b0ac47593c688b868a9e3cfca81fcde08053ddc8f629
font_02_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1