Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa3a8dc49497d39…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2f7c06e438af9ff9161ac67bef89671 SHA-1: 244a651f6990c469758dfc486468a76d1edd7338 SHA-256: baa3a8dc49497d393421ec0354f0ffd1c4e06e4d58ad058b9add08d2be0e5bc6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on potentially compromised or disposable domains, designed to redirect users to other PDF files. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393eda3d6d4---57112538682.pdf In PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/kevuxatizep.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/kitabosivofuzokori.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/wijosuxituvajukitaw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131296216723---98135761570.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • https://capecoralliving.com/media/file/wavolorataxej.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/pixiwabesi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1beea832---10371671037.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/9112396233.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/60290879726.pdfIn PDF document text
    • http://inercial.es/uploads/files/54555027868.pdfIn PDF document text
    • http://dobermanncz.eu/files/67503850998.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecec15490d---61464380666.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/32390006552.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/neloxowerewivufusefawi.pdfIn PDF document text
    • https://keongracun.org/contents/files/fewagijuwenukaranigupax.pdfIn PDF document text
    • http://giga.sk/storage/file/82607568435.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/81425867305.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joxexewimivobatebodotunu.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/vezuwerib.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/78244095052.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/xigovoxojasowibowuvebez.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/5995759853.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe8542bb---97404352991.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/lakaxuramigiribe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+choice+og+mandino+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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 10616 bytes
SHA-256: 8a150f35e93be70fbb513cc99477b8d11412f192c777534d410c6dfa7ce5a0ff
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 16912 bytes
SHA-256: 604b0efb907b15cf5241e40ace39d7a603c1977214559d375723424f3953f3f1

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