Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1999901ee2d3ab5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 13:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e715c01adae3e168403d9fd285ab0112 SHA-1: 665226381d9746bede676321f1f586ea01e351ee SHA-256: d1999901ee2d3ab5df351bf4467c5d44b035a9b2ecdb74ca7e7ba9b062121d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to serve as a lure for further compromise. No scripts were extracted, but the URL redirection pattern is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=mettez+au+temps+convenable+pdf PDF link annotation
    • http://www.pics4us.de/userfiles/file/mowokoxarowit.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vulopux.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161194b499847a---vexatafojibobamuvenop.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b5fc45c76faeac1cd880b785d15fa034/kusomotakolefudowutuludog.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/kegonurizefonara.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/9126559433.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/60g2pvafkbq4io5pjh2q293dt0/xilila.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/q6nhrt4l84e0gqo0sbdt54ntq7/92318733960.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/79465679892.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ofuc27d1oq5tjokkqlfq7balff/23239261038.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tukukajavozimijid.pdfIn PDF document text
    • https://0900107678.com/upload/file/8101117088.pdfIn PDF document text
    • https://penzion-palice.cz/content/84215599028.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/duvisesitudegafejiviro.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/11549830838.pdfIn PDF document text
    • https://gilbertems.com/videos/file/70907805868.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108301659571334.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/mamaxarafidabuzigalosif.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/foruxanoximi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c8d1d480---95296740498.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/ratomonir.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cf8483ff---85496014000.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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 10948 bytes
SHA-256: 5a6c1deeeeb7bffc1f285d928ea1e9097f6cee34f58b922bdfb7f83e1888bd7d
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18908 bytes
SHA-256: 0a26fd3c09555345434119a5a5ded93950532fc46a82ce068124cd8565d1d1f4

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