Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc9d33c4eab74b8…

MALICIOUS

PDF

66.6 KB Created: 2021-09-24 18:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b757f14b90fa577cd4edb62f07f79a9 SHA-1: b7af6dad15ec0cf9b4e6b07654723f57f0862759 SHA-256: bcc9d33c4eab74b82c15c6983ecc3c2562820f79c170ad5bb6f03ef015d9eb98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users, potentially to phishing sites or to distribute further malware, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lsneotek.com/ckupload/files/nepopomininuwarog.pdf In PDF document text
    • https://99shayari.in/userfiles/files/56103665786.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/95104374370.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3nb410uag1v86maurm7gsstnbj/tasebixodezo.pdfIn PDF document text
    • http://0953057778.kad.tw/kads/ckfinder/userfiles/files/11523471485.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092302302673499.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/gasegexofu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaf5bc682d939c8e0efccaf70d2ca9/bokofe.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/35792636381.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/34891856433.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304051a3bfc---2297550177.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/guzawuzo.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/644895279.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lexumoju.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/wonebivaluzoraxadorase.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/kosibi.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210915164719.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/98146005819.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/xigibupumizakosodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=beauty+shop+in+spanishPDF 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_off0000a8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BD 14740 bytes
SHA-256: 877acc08277c8cb6ce89b18485bf318b54bf5c48bfbd7301987f1db17c311713
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 10472 bytes
SHA-256: 89d03dc70b0f0108a41d8fe8c50071595c422e4271f509e8d8e33270928fda1b