Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b74a8d43a6be26…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 09:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90edf409360c8fb62517c80ce8a8fe5d SHA-1: ab30cfa6e4f4e63a323968eb2850c3ebb628b062 SHA-256: d0b74a8d43a6be26cfaa12740f8348c35b26d9120796a06a9ac8921a87ffac07
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting domains. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://coretry.ru/uplcv?utm_term=all+file+to+pdf+converter+offline PDF link annotation
    • http://at2apigroup3.com/contents/files/28375560897.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/69431029702.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/jenuzavirulokime.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/73300260442.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160812ee84c474---sixozesolakoradigeloru.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/21395495011.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/39128983275.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aee922c1c---mowuxivakako.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/dudanoliz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7846ead0d9b5a96cc005aec1b672ffd9/rupasovu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/narode.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/80741663113.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/bakuvosedemaxivuratake.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/surevimegomijumajafuxe.pdfIn PDF document text
    • http://abc-tel.ru/data/File/rojebon.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/46137517090.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/rasikepoxe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5e96c54e---bavejawukepotowo.pdfIn PDF document text
    • https://diphong.com/uploads/64928434890.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c58b695dc8a69ffe54a5a4f0820151/tigerebakopumebut.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083ebecb1dbf---1875132170.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078089bbf859---15170748022.pdfIn PDF document text
    • 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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 17900 bytes
SHA-256: d80fdbddd306faf8b3c9d792d497e7ca3f4fbf59152e06210cf418f4fe011beb
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10328 bytes
SHA-256: 0767b32fe04850d2131664337207c3924e2a436e43ac5552106413dc57550094