Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8d4610b6722cac…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 12:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dce559569f13a1b380eaefc3f9a23417 SHA-1: 6987c8807642bea32e7edc204f47eb7603a65780 SHA-256: be8d4610b6722cac1bfa3b93fc5268927c6fb90094e67a986cdfe65edb2b15c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bluecars.pl/userfiles/file/61508423133.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5c4e0316---90163233069.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ph9k8tf62c3808bbbscfvcc4a1/97586345408.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ce7c7b97---biwasifademuwevusole.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/bivafuged.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/talokefod.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/49074329021.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vufiwosobubavasu.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/8456056162.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/11139031765.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/vakitux.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/72116645321.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/giluwarawupoz.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rutotekitavebujigize.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c6344ffac8310202c7d10385195291e9/sijewisufuwow.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130563f568ad---filozuk.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nojudonafa.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/karutizoj.pdfIn PDF document text
    • https://semut73.com/contents/files/tazomo.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/34521609453.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/560aeb424000b0586242c576166e0eff/1827485329.pdfIn PDF document text
    • https://digireg.ru/upload/gafitifozigotidurigusepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+you+see+who+viewed+you+on+tiktokPDF 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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 18124 bytes
SHA-256: 8bcbbcf23efe5a2b47e48a8b08b4c2711dac8cfc5df6a342d5cb4500bdb94fe0
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10688 bytes
SHA-256: 399f82fe28e2f1c35951d7ab80fede1d894f1598cad52a5c2c2774c8eb1731eb
font_02_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1