Malicious PDF — malware analysis report

Static analysis result for SHA-256 993c879f24609dc8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-19 08:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4dfa574844cb483f51d1ffe4fe7223e9 SHA-1: 9313408cf52b2d910dc979ff076847f3c2eeaaf6 SHA-256: 993c879f24609dc8ad78939ff6dd6ce03edba9557e323c5d52f2bcfd46003d19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=teorema+de+probabilidad+total+ejercicios+resueltos+pdf PDF link annotation
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d5cda6b97928b8676ba0dade7caf5c9f/dogadamukutikemifufiwataf.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/77941358267.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f583105b5f---febukovuvujotopibudenox.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/69070741673.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/91039989299.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91c67f97f---wezawamen.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af8f28a03---vikumi.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b3a5051500e0bc83ec11b62ee74e8487/72309107511.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/zugifewirizexefex.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pk4anmh2352fm4q3991kf39q87/narorewirakeju.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mokazilegixifezaxapawovox.pdfIn PDF document text
    • https://12shio2.com/contents//files/13331239154.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2814c9db0---loxagazowijobew.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/witivadojaj.pdfIn PDF document text
    • https://bor-diing.com/upload/files/kesojali.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/37455727093.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/xabos.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xobexejuzewajadad.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/63528291900.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/51666108156.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/lobilopiwup.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/t1h23r61n8mbej7q01mn3vect7/musatapufalodo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jusevunomaviz.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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 11008 bytes
SHA-256: 084989bc4254977fbda764c08c67c1c8b0b70f22621281c85022d724d77db4af
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 18904 bytes
SHA-256: 7b5a0a47a8ef71e95dde057d74c800df09c271b58fad6a399b29f1c08b144566
font_02_sfnt_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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