Malicious PDF — malware analysis report

Static analysis result for SHA-256 295decf6d166a73a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 14:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fca62b530d28153b75f4f635c2f760e4 SHA-1: c2cc04006214f07dc913310e297dc2fc6d7e6d0d SHA-256: 295decf6d166a73abb7f194858398df6a4ac4f382e2575e293578187b5980ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=tneb+gangman+conduct+certificate+pdf PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/o855dorqf0prblb71bh34fe2m5/lajetu.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/desinetevurived.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/5197370626.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0955b1d04103ad67a7580fc3d6460b97/60456525450.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2fc4d53b---kuzarekegosivuf.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/kupemimukakusosenotinuva.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/kipixa.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/xotopesox.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nuboranedevelizowel.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kuziserog.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fb4d4d0c61cb1251e688744261d0bdba/35312690849.pdfIn PDF document text
    • http://rurisnet.org/images/file/pejijabotafe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c741a02ffb0---36631698765.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6258c03d---28861176768.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607805d422017---32754148980.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/jesakin.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/74583128497.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/49221745719.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/xodonedasegodanarum.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098584ea09eb---21447441716.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/sipijulugivedozumisuves.pdfIn PDF document text
    • http://flexicourse.cz/res/file/73840951443.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f097e07c0b---kowuvudiliretodutalojux.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hg2b1hna5v220tbj41hmhd6djh/25593274271.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437f157666---94171607472.pdfIn PDF document text
    • 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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 16120 bytes
SHA-256: 645358b9fa72446c803934c5091c5955ee312047d1b8bc819feb8992c3023a0c
font_02_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10952 bytes
SHA-256: 8b93879ec74728c57819709e41a07275ccdcb887e6292f76d501df17f0ace63d

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