Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5748d8b07a87b8e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 23:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbe21c84d1e0ebdeefb44bf4b4cd75da SHA-1: e4644dfcf0889b7249dfdf071b560ea2b352816a SHA-256: a5748d8b07a87b8e2e618daed0c79a74cfca82b69e1433505a5af9d4ae3e0276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and a high ML classifier score. The embedded URLs suggest a phishing or malware distribution attempt, likely using the document as a lure to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1e248ccb---57752424510.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1dee50d1---gufegubofuxuziruwefow.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/bovorulufaridalobunu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/97159529781.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160981b0bb6e71---80839132531.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/75115114259.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/sodezikaso.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcd969d22c---tugafon.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f9412429---tamawoduveravomo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinemuzigopawexobawu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/22117849515.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/88447959429.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bf1c0f7d5---42860988953.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/aggoii6l7h1rci99jaf2akkgu4/weragipafakigenejaso.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-24/images/files/54643482228.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/89376818947.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607806ca888fd---145501774.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/37135038754.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c763325866a7430b23539b4b363c0c65/lofanimuxavujol.pdfIn PDF document text
    • http://contelex.it/userfiles/files/74063407030.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/kivowozere.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/8755637351.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074af4f3e9dd---93619973608.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/zegatodumesurerekofip.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/norefonufejowijinor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adarana+application+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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 10460 bytes
SHA-256: 952099a8e2f9430ce3c2b5c517d53406622af9fcf91c48713022635d248aa97b
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 17744 bytes
SHA-256: c545a05bd8bf07ca6243748adae947c9da1e29bb1a04c2460a936d9da56f5e5d
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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