Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b616357ee9f38…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 18:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10c26d3f4702f09789bb6f9a2def3923 SHA-1: 86470e9510f81f3fd8e0341c03761928aa5d582f SHA-256: d39b616357ee9f3889165165dab9e384d17e2c26f35d2ccc83d30b3badcdd6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised CMS uploads, suggests a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r8u54th2ll5prg7rbrk4jbi0t2/75706292466.pdf In PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/47192459116.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zinozademixaxoli.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/ximopobed.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9802b5b6---wazojadexogujudagagi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/vemagowe.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/81605920534.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/garazatavewekazitanopize.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/13040850356.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fho35fc4akl167bl1pn6ikeudo/99591188032.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e0089a9e---jororusimizeb.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/93631091712.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d61c75ef4e661b795d348c474af55c0/45889390932.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/muvebefubez.pdfIn PDF document text
    • https://aneri12.eu/res/file/xejasim.pdfIn PDF document text
    • http://www.toptehnik.si/images/vepuvutavovitejig.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/30492735025.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d22965ad54852200be678f58cb9c6a2/gujigem.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210618_111005.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcfce1948---4245316558.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/87213406233.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/12556543731.pdfIn PDF document text
    • http://novichiha.ru/pic/file/najuwufawujafaxo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/97661409732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kissimmee+fl+to+clearwater+flPDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10468 bytes
SHA-256: 7d2174e2d2772709320883996ae3ba7f5360b2d7d8697fa0709ea55807af7bb4
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 18080 bytes
SHA-256: e6208e42afc3d1163223c6c7a9f1dd61d78c7c575cd55495b669335b8afb7e8d

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