Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d47a22a940c79bc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 18:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dc2a1d9fcce49824daa4338b858e409 SHA-1: 2cad95049d30028bdf098e0a59d564ae9bcade90 SHA-256: 2d47a22a940c79bc312bd5c14d30553639afd1af32dd8485997b63707acddd5d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.radanhorse.com/resource/files/69163979877.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dbe3b5b9---somugudef.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/93135794928.pdfIn PDF document text
    • http://alltechsro.cz/files/66208861850.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/77351034597.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/vabumepajabozowumaremir.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/wezamig.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7938644da---wijimodaluwezodalodekax.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/bafaboxojen.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160908d259aa62---81643214484.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d7f06563951ddf948cedce5ed7f6faa7/razogivudulevixezixewazi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/13784173989.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161216a1f4f979---mikezefebodipipajovin.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/45967047011.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e1d459eba3b534a5f3e57286cff7df56/13057014888.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/4c04de518543dfd8c8473bd2afb2993b/80631644577.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d082e7026c---86551100643.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fusugoli.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/venume.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/94731500923.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5cf10708---70797167324.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/23647575440.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/81506500089.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5fcbcebf---wanewinikafabivefuwag.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086192036422---41549339078.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/3458419556.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/situjasonovupuwegikinusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=retrogradasi+adalah+pdfPDF 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10720 bytes
SHA-256: 28ee6a9fa2d9e49c0c67175ed36bb54f645668ae648ea0021319b9e9d2e07409
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16372 bytes
SHA-256: c522d99f8d873e78acc7a969fb094ac6b53463ba3b1e4249874bd4914f52a17a