Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d099fea4dd21e22…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 01:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0589659349d84a7414f86182938c2ad5 SHA-1: 61d4dbd7f926f6dbc8aa5a03dda3d3e8a1d9e3ad SHA-256: 6d099fea4dd21e2212047ec514e4557f801672737d25a09077f2207cf4b4e6da
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing attempt, with a high ML score and ClamAV detection. The embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to download further malicious content or visit phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://runwellconsulting.com/file/file/34894596690.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/wixirematexivufavera.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109031254487256.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ae0d65e4---zodafogijunade.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/30327184363.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/kukago.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/84814532951.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8331d5453---65152614296.pdfIn PDF document text
    • http://canadianrockies.info/files/file/repexelovan.pdfIn PDF document text
    • http://cmtsport.com/pliki/2852781073.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pawupanogube.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/30085148991.pdfIn PDF document text
    • http://ceroki.com/image/files/61498457851.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908183615308.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/19310604972.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/74759349418.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/vupaputakelakisox.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kurugif.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0e8ed0a1---legidewidizujaroko.pdfIn PDF document text
    • https://computerzone.pk/file/xezerafifenugasama.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/40634527605.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bfc75c08---watadedese.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630776564.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2211a59f1667f50a61816f36783c050e/jukazisapisuwejomamesimog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=purple+cow+free+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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 10176 bytes
SHA-256: 8454d8f4f1f46f3dddc409c3f33dcc83e5e063a0f4efd34da32734594fbe4648
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 17424 bytes
SHA-256: 89362c267bdf0f8f48422a49b9ed038dae9fc97f8668566e405c8ad4edd0ce12