Malicious PDF — malware analysis report

Static analysis result for SHA-256 2184213e7cdc42eb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 07:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c9d1b1d9d5d9a9cbed2a6be93612a2e SHA-1: a7c274f3c59dd031203d70db8776e9aa9625b5b8 SHA-256: 2184213e7cdc42ebd6d7248853a733b1014abbe419a32ff5b1b02130cbd06ae0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm on disposable hosting, further supporting its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=psappha+score+pdf PDF link annotation
    • http://webursitet.org/Files/file/97803507951.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a160590d48d168c05e896ad99d664fa/41213965268.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c1f2e67078e64f097c80ec036e7be7b6/73165967466.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/34713443735.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b63f879d79e6d8d30049d53502a7eb0d/jubadune.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/6712796559.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jutapojimarajofibagaruf.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/94487c288bc274231711b10a2dd9e2fe/78921565651.pdfIn PDF document text
    • https://iltuosarto.com/file/nepejakivafavanizebofim.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/72756694710.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22521f980---46943629620.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/3026553883.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/pozunuvuwojamova.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/muxitew.pdfIn PDF document text
    • http://cx-gl.hu/images/files/1641550393.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36705336340.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/1697905553.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/lojusudojokajuzez.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58908140660.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/13825186430.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nkln8ej49odq3cjssg2vb9lq3s/nupedixoviv.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/jobenanemoronuganopo.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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 10376 bytes
SHA-256: 727fb8e61f3b590e35477337eedfb0201a714ca3299fbf8dc022898d99e85f1e
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 17680 bytes
SHA-256: 0f33c4a324ba84b7121081a7b08b87bee121cee50434c243963835d4653813ee
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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