Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a718fac379720f2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 09:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d52c12918a2c473a5904d4bb4a54c6a SHA-1: c4448fa18ea4f95e5a2541e22b2ee94463a71c4e SHA-256: 9a718fac379720f238a0c870b497e927c1c4b8d549131ba0f8a0542e224480a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=manualidades+con+carton+papel+higienico PDF link annotation
    • http://staractivecollection.com/resimler/site/files/vesamibeleja.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a081e6af73e---3148970639.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/jixibedenorizu.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/dafilusatokesoboba.pdfIn PDF document text
    • http://webursitet.org/Files/file/56024005464.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/pefifiraxunegabamo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/40369438673.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2a56d4dd---16046357625.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160925761d0a64---vevimonufevadivovokupu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c005d8c80ae---21964486260.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/tulizakasumexapi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160add02af2377---74139394198.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec1a9ac29---bitilururonevuzakenudude.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af93e0a170b---75986998977.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/16sq3a1j2c9iv1psu4un32jp9m/durapotixa.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/85760248885.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/denubowerafafipolid.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869e1722d2b---totedarogupuporokebamo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbacdb620b7---21842695545.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/defa62400aef2acf731600220fd8c915/webanawerasipijawevi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b4cea4a744604985c3bc201fa3d3863d/pexofutibatetijedumuweg.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kg92e8blsqgb6spqhn423lguae/mofikanisodawulutisagin.pdfIn PDF document text
    • https://subded.org/userfiles/file/79635155491.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/960048785.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/zalizegajaxarogaxefimem.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9078a768---berunivuresa.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/86091292314.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_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 10888 bytes
SHA-256: 5c94f8f1f1c82db75d43409e5854c6e7a6862d66be52bcb44c019b54c677f8c0
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 18464 bytes
SHA-256: 07c9d24cb1c3b67c3aeb067484421ffbf8f9f67d468bbe9db484b72729bf9df9
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1