Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed60b46a1e210a9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 19:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41ae325dc98e6c4191137253fe7c51b9 SHA-1: e05c4ced17b1173fc43fbf48fb68771876b061db SHA-256: fed60b46a1e210a9d33b514981cf6f1e15b98d92d39c497fbb1710404f0bc5fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2109c8c8cd1eacd360b469af5c289711/kovunufirapagejudevul.pdf In PDF document text
    • http://rideco.hu/upload/file/mivus.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/siriliraresole.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/15596157824.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820de0db18e---jixir.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/55551779783.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/87600692064.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonajufikeziwetaki.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/88804910212.pdfIn PDF document text
    • http://ubest.ru/images/file/50825367130.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9cc0bd636---binikolojabapug.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/xomet.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/72025142638.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/44dec9a7fa6dce7a75abc3949c7cd145/guvusulinon.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74844420680.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/sumuvez.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609175d3f1ca9---sewuxeta.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13819ca4---59258138526.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16239347368233.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/juvovusubadafe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9fccc1fee75e8c1d4bb2802a04e3b5c9/9697356699.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/susululovig.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/xoxugebuvebefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ruby+sparks+zoe+kazan+book+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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 10804 bytes
SHA-256: cd7746aa3df7582a8a9c15732d808894623e9cd5737dda1098bcb18221b3462a
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 18132 bytes
SHA-256: 3fa1c886a5d8078d6f703ceb589b701f3f76b301ee5c5bb9bcbeb4003568b0e1

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