Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c7376aaa4e1b90…

MALICIOUS

PDF

77.6 KB Created: 2021-10-04 22:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa72509ab48279af4bd4f0cb02c3cfe0 SHA-1: e3fae02f8fb96cf02a047c04dbd10f70e0623cb9 SHA-256: 31c7376aaa4e1b90704a6c5b98b082b11b91081423d0487b47fdfac40567f266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=bill+hodges+the+outsider PDF link annotation
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ferafopoz.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/99258600535.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/fudubapeleguvan.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xufowenozazokofapitiwe.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/50365573805.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/teduguviwesuj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506419639b---73552018376.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590391460b7---jawibazakewitaxoruzawim.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/paridisoro.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wozutunimaxevelas.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/2426964014.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sefuv.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zokubenoguzutigawux.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kijasebenazazazijaxibeb.pdfIn PDF document text
    • http://houselandia.ru/files/90723221666.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/19478687104.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/55009678900.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/dokujiz.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/87468000640.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xebipikotolajudowesuzobov.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/dulitamotozuwozina.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407a485873b---80568415607.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/860266685.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd8ee698a---857888635.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b07a62cad81add373b7e9184e33d7a55/bevajuwivupasazixudozi.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zamesupen.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10416 bytes
SHA-256: a2b1f14b8a0862baf86c93f4c1155f9467ece221aa45bc8001376718b5d8ed29
font_02_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 17272 bytes
SHA-256: a9ba547dcc7d88e501e0580615550f99f0ee9886b719b4bb7074dfcb1d70ca03

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