Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba33ef11e41a3e92…

MALICIOUS

PDF

73.5 KB Created: 2021-07-03 21:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d66fea3230ae5f3ff38e8203c5c84195 SHA-1: a1a3fcef907a280a37afee42037e6f768210cd47 SHA-256: ba33ef11e41a3e925f4053afd48da5843388d03be34d84c467e57f6a671c9b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

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 http://tvkinter.com/file_media/file_image/file/4368442036.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a715422ed91---fosawove.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7499df668---10043832069.pdfIn PDF document text
    • http://learningkey.org/userfiles/67343948995.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e51772d68ede107e345ee6e3c2738e60/lasibifagefapijase.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/tolaru.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wujatitadepewopoxedepoxix.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/80196734347.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccc84a579---zidaditabulozomurujidade.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/um5f52vljj6vj2efmukcqu1aq7/jugumibi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/80945569694.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gexakakobufonusuj.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/selumozenewogusutoxij.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ec669340311bfe160bd12d20dd1f3440/kijapajapiwur.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/4e7f543a14f544cdce29e5670e559549/10322071963.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kh06c7ubdiqhs7338fdf9ssvus/benebu.pdfIn PDF document text
    • https://argumentua.com/i/file/80730321439.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/negifonujitegife.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jozupokafule.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/59495832667.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d41523952---kapefune.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19a83d78f---kowitiwugiduluboz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f0c2dc9d---45890919327.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/03c656f93dd3a4128e5d201988b725b2/falasevoka.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d91f79f---57202774785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=out+of+the+blue+123moviesPDF 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_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 16456 bytes
SHA-256: 5623634ccbbd1b5d073e25abf3e2ddae413e3428fbdd6fed78baf7c543f12e2f
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 10788 bytes
SHA-256: 0c5f440b87e1ec6abced1d6a55c3d4f1d56e75dfe108397efc52e8abc737e8f7
font_02_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1