Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f305d762e96150…

MALICIOUS

PDF

88.7 KB Created: 2021-07-06 23:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6cf2c1dfb5e9e991d8b42800608e4754 SHA-1: 967043f0a8089aa629bff8c250c93fd2fcf2e198 SHA-256: c3f305d762e961506469eef38d895d76989374a10b7076c5e0c356bb7e3fcab0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=hack+coin+and+diamond+mobile+legends PDF link annotation
    • https://culturasiapamplona.com/guiarte_userfiles/files/81612939757.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b8vqqsdh87c36lgm57n7dsir43/muwizi.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/betupixasivitivajosojil.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vibunupigezuk.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7dc56631---metoz.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/60512934603.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rf3s1rvr6ek9jrcgq013tv96s6/48839897039.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d02262713941906a26e983a0b25ddd8e/genozifobiditozizodilewo.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/161440520.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/70267925283.pdfIn PDF document text
    • https://arerp.kr/data/file///73197915216.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gikufegogarukenafufuje.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114e970fd9---17748714619.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3gdgtrcm23etpa6rht3jtue998/37868379008.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075610fd643d---xoribipovusedoli.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/5626799760.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/55607911880.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/97dd8910eee3b6dfa6583e5341b86cae/62405356660.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4008b3f20---sefavad.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/kesaxirorilafobimoro.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3662b29c2b---93464167917.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b17c748b6---safis.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/pokifitapejivolezik.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ppvvvkl091u83c3m9310afae11/49275995411.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wexijora.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b13d0d5e9daa5c1ac3bf6c05c8e2df73/xesisejilajubir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 17528 bytes
SHA-256: 2a70e344f6daf69a6ad4d74fe33f864aa4a3f864db4bd83657863cacb9b9a3ca
font_02_sfnt_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00013c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C76 10740 bytes
SHA-256: 5fcee3c376c07c26f54555066b9f49555cd5bf18ee4459d3f8555e0cc292cb79