Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b33fe971d2e67…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 23:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19e01a265800027780e0cb24a0aa53df SHA-1: 8381b8850adb461e29c235f49729c2250076b3cd SHA-256: bb6b33fe971d2e67ea59dade8e599440473084d145c562f459baaf2266461f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, including a link farm hosted on disposable domains and a link to a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://art-lan.ru/uploads/assets/file/mozaxe.pdf In PDF document text
    • http://rund-sro.cz/UserFiles/File/zureguwi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/nobofodexusuvagixitu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613602cf195c3---sidavajavejisotugawalo.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/jekejosewiforuge.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gixavomunop.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/29949223571.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f076945b---7181523157.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219112222199746.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/64668507415.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/duxapopa.pdfIn PDF document text
    • http://4bx.pl/public/file/novibefuxobipox.pdfIn PDF document text
    • http://klenderbio.com/upload/files/45849686599.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/6354652935.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/basekizobepaxewaded.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/62155786257.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/74687160029.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138588ce96e7---80084877187.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kosusulezovepisux.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/96112251143.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/36116378051.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/wuzapunudobemogomufadagon.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/40131424744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adobe+photoshop+cs3+crack+onlyPDF 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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 17940 bytes
SHA-256: 08960701775164e4cdcbf0b02f5790dea3bba051c06fbbebe921a6d4a6cf7247
font_01_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 11016 bytes
SHA-256: 5e51b0c4a4243f0db19d69e775b18dc8d1756bed4a1d54e21a08e943d40fe77a
font_02_sfnt_off00014025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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