Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce37f311cb5b540…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 20:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e8e71cc71728555d98db87e069b910e SHA-1: 637b1038131da9eddb2de1365ab4e3151a494a10 SHA-256: 5ce37f311cb5b540a190b23cc26b8d14e4e76a12455d62567857af7ab86ad516
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly indicate a phishing or credential harvesting attempt, likely disguised as a 'Marriott authorization form' based on one of the URL parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/pafuvozuginamofotodo.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/zojaviripulizaridetuxu.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/nojezadumoxe.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafc5e08bf---39555480292.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/39360531882.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/fidobojunajuza.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160825695cb6c4---92354035861.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qlqhftr7am31hh3eiuha326je4/labunuvepomekefelije.pdfIn PDF document text
    • https://datajournonepal.org/files/68052328013.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/t1od6dckcne6bqivglkf172klb/gapow.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4747a3cd44---zuzivaja.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/23610978122.pdfIn PDF document text
    • http://www.pilartangguh.com/file/83517232178.pdfIn PDF document text
    • https://samowar.me/upload/file/rakawutekubu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/foragava.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/62087966157.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb1d9071a---tosorodapuzulowewidukoro.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a97191ef70c---17558793765.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7c28dff2a79aae6af47d5f4ce8d1ae5a/megumoduronat.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb64df86b---48863706379.pdfIn PDF document text
    • https://medtek.vn/storage/file/bunusexozekedubos.pdfIn PDF document text
    • http://partnercable.hu/files/weruxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=marriott+authorization+form+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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 18816 bytes
SHA-256: 73ae85a4981c69982bc3f549e211cb8dbda56e24b8f37d7f4a46d09d7eeff01e
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 10572 bytes
SHA-256: 15eaf57f31979522eeddbebb2906f965e1c1a7ad6d5c097570b9d12b05c9ed62

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