Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cce79668755592…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 02:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26d9522f709cbe7d0d5cc8760a3bd7a1 SHA-1: a888a7f2c616943d4720a6fac6c81494bcaad270 SHA-256: 80cce79668755592ad7f025d6df6924d8f62ab9cfc187c19df2ab571d94d242f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://zhjpharm.com/upload/files/begokifilafokikij.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/97059836878.pdfIn PDF document text
    • https://nyig.com/files/file/19459397497.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/851e532b363b89873de28ca6dbc8676c/69092718864.pdfIn PDF document text
    • http://geoman.cz/data/file/65581650486.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910cfa723f---moxugilupizub.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/pozifovilaxilipij.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/megizunegefovojobisuteke.pdfIn PDF document text
    • http://bastola.org/userfiles/file/toweliri.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac37b3002---40081485711.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139423171c53---kefixuvexagemuvu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613736773e10f---nuzanivawovefus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f6742341---92000239745.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/6800073055.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/88422284558.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/bekujiruk.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/vuzevodox.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zuvimesiduvemo.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/86079274291.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630699698366406628.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/81253315340.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/sidora.pdfIn PDF document text
    • http://precisao.org/files/files/zejumukolow.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/debelupenolupo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/fetogusatokifememegi.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/10305002697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+online+money+cheat+pcPDF 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_off0000b538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 10592 bytes
SHA-256: efe133cf0ce0b0dbd9de124aca97bfb2b5ad833079c4eecfa199f0ebfc97ed9e
font_02_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 14380 bytes
SHA-256: 38f423e76a07a24c81987a1b43636a56ec7c64a788a7a749e4be6c7b5f4379cb

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