Malicious PDF — malware analysis report

Static analysis result for SHA-256 e461e8a0c12d6e5b…

MALICIOUS

PDF

77.9 KB Created: 2021-08-28 22:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41240baa8286c4e71160bfb5ae590744 SHA-1: ca636d38e9a1e16da187e038752c80bc452db24b SHA-256: e461e8a0c12d6e5b2384fd55c585c6acc923a3bed176d765e69aadaaedcb1d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.urbanwaterways.info/files/jadelas.pdf In PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-9/20210809135511308619.pdfIn PDF document text
    • http://primaneighbors.com/userimages/kinegiberaj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/82ae48428eec8f5472beed52e61d96ff/takugi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sulijuxazefazorujuganu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/60915161183.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tapetap.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21338152335.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7db980e39d7eab375633cd8a192d3a91/65434264151.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/92053008603.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/jizizoge.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/satezomasulo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/50621652585.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lthhajugkv1ahrh40p0mjrlmh5/46138866438.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rijipuluzevenejejuzo.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/27435125098.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7306b2e08e962ca7b51576036fd0b84e/vipejakarizagabusifabiwab.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fb2394c9---jeziguku.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tifapiraxuw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/15f8805bc1c1465d358ec6f08fb67406/64244881427.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/25365506560.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/14263352804.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f50decc46---39801848430.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f54207182c251f6b15a18435514956c6/detetubepafakifomifakupi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcdb9f5cb---doges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=active+and+passive+voice+pdf+exercisesPDF 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_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 10716 bytes
SHA-256: dad0cb62f92890c8df29a647cf80b713dfab7465df5301fe606576219e0f8c39
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16936 bytes
SHA-256: 3e375541db9ad73fc08713d6f75b2378f7526b082cd05d3b2518b7ba0434349e
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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