Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c76486c600f04cc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 22:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 404cf809c571b3e282cf6afed86b4fd2 SHA-1: 081fd24106bfd57f892ce5954518e235172eb49b SHA-256: 1c76486c600f04ccb4f441d6b6a0d98ab96b92b400196b000585d8c000a8d807
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms indicates the document's primary purpose is to redirect users to potentially harmful content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304051a3bfc---2297550177.pdf In PDF document text
    • https://vozilasavozacem.rs/files/24813096735.pdfIn PDF document text
    • https://506hlapeta.com/files/file/55028708955.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xinidufil.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/35228040426.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed568de154---52506130374.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gazeruredonivunolijojupev.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/56877215028.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/79121082443.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/zejetuwuverikoganaseka.pdfIn PDF document text
    • http://apsons.eu/files/file/murijajugufifolekotofe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gdg2b7g1peqsl8b35925sh9vua/nudoxidoxudejolapesakur.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/kivagamozitadojotivi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4103344724be9ac5c9aad11f76d9b5f7/42568599659.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/10226481661.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/19885406646.pdfIn PDF document text
    • https://campermagazine.tv/public/file/4961649779.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/mejudiworazilapamig.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/42512744552.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613815974ba1b---tolepogaku.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/gugojolut.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/werurojapipexa.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/56497231988.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fozotatubofatisakorejo.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/tirufuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=new+battle+royale+games+2021PDF 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_off0000b190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB190 10868 bytes
SHA-256: dcba1601d567db7981d9b23806c6f2473867435f0f22b8b3d8fffac727123986
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 15156 bytes
SHA-256: 28e1795c5947c93a0629c37c97280300dbf8fe315b2b388ffe488e1bde1f8029
font_02_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1