Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c463564d6af9f7…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 08:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9e015b37910d5f02696629e48b05be0 SHA-1: 42a2a771be371ed9c25a40dcebb7d44a8aae1bab SHA-256: 26c463564d6af9f79a85a6b7959c280a7218a303a34a69d1e672c5721ba23813
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to distribute phishing content or download further malicious payloads.

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://coretry.ru/uplcv?utm_term=gliomas+pediatria+pdf PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5be2f0fd26---85265355836.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/dugazeb.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/regaguzor.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/xekimunemujisizigu.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/rulifevivejejiditekapal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ea2521a9---zizumafetanuxuwidar.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/58241131883.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d20ef1e7c---86367550357.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/26447967639.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/3046243193.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/vifinoxeji.pdfIn PDF document text
    • http://remobudostol.pl/pliki/74141412220.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5c9a5b48---82079210550.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2263294a38e8798dedf2a9f66eb459b/lutuxikawowarefedodekesax.pdfIn PDF document text
    • https://codecs.roimages/file/45728071389.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/78564936392.pdfIn PDF document text
    • http://prestopc.it/upload/file/29143349319.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebb5d9d03---21373649492.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/vitetugosazapu.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/34171660112.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7932aed7d7950926976bea11b38ea651/2048847581.pdfIn PDF document text
    • 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_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 19180 bytes
SHA-256: f77d50ef2f1c7ec616f0923028279302736ab4d7e474b5966ecbb1d99c8aa8ce
font_02_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 10592 bytes
SHA-256: 033fdd5e6b81e59d0cd1653b9679ccdc83af9e26a7af39165114e791b195a14d