Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e227de2fd16821…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 05:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8ba1c88b24d1ddaccadc66889c3b560 SHA-1: 13500f0a0f85d24d3c8733ba2d9c18e791c642eb SHA-256: d7e227de2fd1682149e0fcae161f3d4a23f63ec54ff15f941ac28a94df95244d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary function seems to be directing users to external content, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/p9tf72jojmmirrbbun992777bp/58781239723.pdf In PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/xonavigivatokilixuwul.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/58554079956.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/kodibepofapiro.pdfIn PDF document text
    • http://halaljones.com/uploads/files/73151962829.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/88095491701.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/17730586166105d50cb2012.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/103661356360cc0df39db40.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773edc8fa7b---53236008791.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caa90eaeff8---74809696653.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/jiketojiluvulizeva.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca0a6efa7---9463752901.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/petodefokiboje.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/39667509599.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/roburezupafukuwafun.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/karumufekamilan.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/81b63c2f9ef3abf665133390138e060a/42459651416.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98107784578.pdfIn PDF document text
    • http://epicridesnepal.com/files/25864749900.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/22726251816.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dezitosukej.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/91175182769.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e316fa3554---56384673132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=le+nombre+d%27or+dans+la+musique+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_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 20828 bytes
SHA-256: 8534f6aa26490c038a818456d7ece42079bc3d6568302dce78b9547af9049d33
font_01_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 10936 bytes
SHA-256: 41e4dc71976aa6cfa2e02ada09755a8a3ab44de72ca569ae74f718ab460b12f8

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