Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdc701b6fc22b4a…

MALICIOUS

PDF

94.8 KB Created: 2021-06-28 20:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00356f3dcf78dd3edb16a99cae9d9ea7 SHA-1: 99b12e7cefb1147790368c9658ab6e4a581e452a SHA-256: 4bdc701b6fc22b4a5a8c64f21971057cf5a49c7bda4dbdce4890f8957e1db0c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://ketchas.ru/uplcv?utm_term=2016+suvs+with+3rd+row+seating
    • http://broadgatecapital.com/userfiles/file/28634614002.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e063ead3b---gutulux.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d7f37322---rudoxapojisixomoziped.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098238370cf7---64005978494.pdf
    • http://augustaelectricalwork.com/editorData/file/23162525416.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/91fjd927669jhu1ulb4pbh8u40/lepimaxunexogusor.pdf
    • http://4seasonstours.in/userfiles/file/sagobenes.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/23a8a0452c029abd94d12f06060c86ee/39075304315.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076899e96d92---jajurujevofotavupo.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2b6bca6b2bd0679b342f5d1fa4129a10/91122766489.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc6138efe0---nanesuwi.pdf
    • https://4appsoftware.it/file/20611089692.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160850227ef031---33957338039.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210617125719.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/46644fc09c6d080f4d449536ccd2dd54/53027034383.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0edd27583e---82930609679.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e8f614eb64e03635421eba0be9cb6ae/36771997880.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9b3dbb75---kodataf.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba4b59668---2804376841.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/72i0j4o5saap5rbpm41fvatpga/56496438465.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39502e9db20b52daf67926c94244e54e/44450570488.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ceb.bin
6eaf6694953bb798970f70c441c2a36874087c6c6d024127e4237567f89cdd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 17168 bytes
font_01_sfnt_off000139d4.bin
fcbc855c1b00099aed626d9378ba837f6f07ea57e8cdac71168fa487c793db9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 11268 bytes
font_02_sfnt_off0001543b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1543B 16792 bytes