Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e8b4034d777d51…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9af40602b38a5e211883553c3cb17dd0 SHA-1: 991b1e3d3f4049c8ca436be3a7b8b80968cb0107 SHA-256: 62e8b4034d777d515b949481947668c7833f52ed4114e98f7cb680147b770eda
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates this PDF is malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content, potentially exploiting vulnerabilities in the user's browser or system upon clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeea0e743---35950449706.pdf In PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/befedaa168b6a9f2ca00d8e2235eb6f7/dibabedagizifupajutofogi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/wokanosavevifemotawulu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/88798866039.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/22175419046.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e14a2186---84244252568.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/67678296606.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6crp0u1hfgtvp4kd2lhkcrhd8l/xekapugisaro.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/46241158716.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lozup.pdfIn PDF document text
    • https://eternalbliss.net/file/topes.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/4042781059.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/sugafenarubirodavisilola.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/futesuxobuxumitati.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a63950f3---bexikozir.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f0b2d5d6---josuxolilasusajepi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1ed1060e---kizuviwupaxusu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84227960118.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/kikarosuwawakuk.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77dc73cb0---66150581838.pdfIn PDF document text
    • https://samudra99.com/contents//files/50432568842.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/bafip.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610d9f2a594d0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+management+pdfPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 18500 bytes
SHA-256: 277ec442e6921d95bfbc841ea1c3aea3881931648d57fa0297db96a848829081
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10800 bytes
SHA-256: dbc77f717069d312533b86b413cb8cf81cf8de21665c63bc9fceafb5f8399d58
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1