Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bddb995dbef9cb…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 06:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd75edaed9ebc61ec59ceda816bbb1c4 SHA-1: bd0869761c3fe8f536215f540862388fb023bba8 SHA-256: a0bddb995dbef9cbd5326b6bc61ac1de5690cbd9771559e3267254388ad5c0e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327e708ac93---16400789045.pdf In PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/28977735626.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/nawosenovuniwarozimufin.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/warinexekajuletududi.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/58259808291.pdfIn PDF document text
    • https://kvzriu.org/images/file/mojebegeru.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8f6c74626297ab1c9d5d35a46efc18be/sawepube.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140159728135---danupiwun.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bexowe.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/botadojena.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/kebadolaxuwojipoki.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/16032964481.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/vexaxofefusuvetufiridibex.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/gawuvalodelukolifim.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/78414129085.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613878c1a8cd0---kuvijagebutoludu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/puretulitavanipapat.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/surifunir.pdfIn PDF document text
    • http://eva.am/files/78d361324ff057b0.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f32de57f8---60336530760.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/79387025072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=el+tao+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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 9880 bytes
SHA-256: 3c4f71fe83ae3cdd7417d6e854a5f9bfb43c525227b9b6e3c90fa0d3e7f36f95
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 18540 bytes
SHA-256: 0bfe523f9d58bd4709a0ec9915e196844597defd76ae99708024cc17595b405a
font_02_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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