Malicious PDF — malware analysis report

Static analysis result for SHA-256 b027c489a9737519…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 12:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c3f7a806bcd8d48216aef4f82b661a5 SHA-1: 99e3eaae0f096cb4940a9505f8d794ef44f727e3 SHA-256: b027c489a9737519b8663c18e82c70785da750ec0704787c748e807b6fcdc9dc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://foundryindia.org/userfiles/file/14889631900.pdf In PDF document text
    • http://ore-processing.ru/d/files/29292076487.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/5518461868.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/gulewugorodek.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/94414823339.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lirixonukalolorodenubid.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/88625899216.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/movuvemusew.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dhq7u71uvuhlgcro97hbfe46q7/36171051981.pdfIn PDF document text
    • http://venkateshservices.com/uploads/wisowuvalidopetixil.pdfIn PDF document text
    • https://gangnampools.com/contents/files/giwutegadakujavolilisagi.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/binevaw.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/sesexipeximewebo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/gofoxizurevexexejomozul.pdfIn PDF document text
    • http://dgjst.com/upfile/file/92989199351.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/81554708959.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ef6639cc---lapaluso.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/96555812455.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/75236422841.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/7179005523.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/bafuwitewuvedesogasuwel.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902111636_mnuzkd.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109051049388434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=oneplus+7t+next+software+updatePDF 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 17248 bytes
SHA-256: 23c92ea8b8921aed2da1937dd2e8b501a581dd259026291c0e6f0473f6395d03
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10764 bytes
SHA-256: d14645540e9be58530c77ec7832bfcb1e25de9641fb9fd203b5cc3d8260cb0e8
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1