Malicious PDF — malware analysis report

Static analysis result for SHA-256 383e2195e702f56b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 06:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0210fbc73ecc50e97769a01e744dbcbb SHA-1: d73072bb60c2db81dcd926acd7c1f2e2e65afe69 SHA-256: 383e2195e702f56bd32467cd7a9b90151f189bfe86824df054e9025f41cba198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' rules, strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure disguised as a crossword puzzle worksheet, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://olech-rzeszow.pl/userfiles/file/87823613814.pdf In PDF document text
    • https://nenanhduong.vn/Upload/files/tumixe.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jidanovopamodol.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/vofavowabibel.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/jafapu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/konoj.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/38470184967.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332343df9---fabedatiruwomatul.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/voxutimaleli.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ruxalowigapidexegevipod.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f491e9ca96---kamaxokepepoti.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16202106679397.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8669b3f79---vivuzesifosonotopewosa.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/ragojamezewevusirupito.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/jekuxavamujimate.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3793938d---dovawaka.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/55349877961.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/datutikepibuwi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2876a9844c80f666f015edf8cc11ee43/xoxetalefozov.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kj4p9rgtna2c2l7civ25a92glk/44079937804.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wibamidulibe.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/edr5l3m6da49drnqbidqvpfpbt/bifugozo.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/sumifekujatituzaro.pdfIn PDF document text
    • http://artside.org/data/temp/file/77532369100.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/68047676548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=crossword+puzzle+worksheet+for+kindergartenPDF 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_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 17160 bytes
SHA-256: 2fa35b80e3d8a156f4750c38756ec3e6cbfcdac68b3614d36ccec22a992f2bc1
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 11144 bytes
SHA-256: e27ebc3c6b583f099def651f4c9c42754e0b189f41985999ffcd00112ca5904e

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