Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc398e5a6c9acf0a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acdaeec37ee4c8e1997d6683ed607ae9 SHA-1: 5b1081b0496e44d81dd81debbde9bff18f04dee5 SHA-256: dc398e5a6c9acf0a7ea846e7ec59b0791f69e70d0d32c37c459498673836aba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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://krisoc.ru/uplcv?utm_term=reface+app+download PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613581a14e395---xexusoraxari.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/denaxazij.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/95615150706.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/efac7cb4ac26afa2102be1a8f4d3c2e1/83978349519.pdfIn PDF document text
    • http://sinners-party.de/media/file/53277929772.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/42970139506.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/lonagusabapoli.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/mapine.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/69221078778.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/burijabaduxuxogedazina.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rewalakesomadekedajap.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/sidabuzeta.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907084805691353.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/23462368424.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/29566246831.pdfIn PDF document text
    • https://jotelek.hu/files/file/mologivepajer.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ee6dd7c6a0---josoduvekes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6aj1l7fjrgu5m92shh5ht8ki14/pepigonujuvipoxeviri.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/3776738228.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/83429696401.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/25127490065.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec925e528---77149146934.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/9962431938.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/xikumamaxoxuvofotini.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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 10284 bytes
SHA-256: 526daccb42e6ebfb2c53bb77577b95fb70987862c088ca04903aef32e8eb13d2
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 18040 bytes
SHA-256: 79e9a947ee856e83abab92fe076c11edbcef2e1a84f9228fffebb96edc8819eb

Open this report in the interactive analyzer, or submit your own file for analysis.