Malicious PDF — malware analysis report

Static analysis result for SHA-256 c783002253a2ec7e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e86e5be4966813c71903335645cfc873 SHA-1: 66c96afc5048af8b906ed173f2680e52146791d8 SHA-256: c783002253a2ec7ee56ed36e0e6911c467f3caea4b4e03004881cb764e8193f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://osakaav.com/userfiles/files/wodupigajodofonoxutofi.pdf In PDF document text
    • https://syteq-pro.com/userfiles/file/92577515396.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/notenifapavejozelipo.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/rivivudanumarib.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109152343565824.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f910a5aab---jiremus.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94412625236.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/74808632644.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d2i09emf5iriis27k5mj0qjd11/mifofewenafoxulan.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/82590030692.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210925_013558.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/janelepagozilapoja.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/7157726742.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/17144533478.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/42566487785.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e9a0c7c190b1388cbabfb5e75361659/74624062257.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/gisapupunag.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/28506579254.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/wador.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/gerunepujejunezin.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa799b950---wunotojinexowotaserobuf.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/wibomixuvod.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/66505453556.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/gokaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=365+office+2013+product+keyPDF 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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 16920 bytes
SHA-256: 196c1b4c052b3a3670892b7d5deab7ec126d787a095b6cfff39be5d1c85bbc2d
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11112 bytes
SHA-256: 069f07a9a82c46476b9f45cd9c53e20ab13162c175981ef30dedffc659c3f53d